When the Holy Prophet (Sallallahu alaihi wa sallam) took the pledge from the Sahabah, Allah revealed the following verse and declared the Prophet’s hand as His own hand.
“…the Hand of Allah is over their hands…” Surah Fath (48:10)
Hadhrat Yazid bin Aswad (May Allah be well pleased with him) narrates about the hand of the Holy Prophet (Sallallahu alaihi wa sallam) “I had the good fortune of meeting the Holy Prophet (Sallallahu alaihi wa sallam), I found that the His hand was cooler than ice and more fragrant than musk.” (Zurqani ‘al’al mawahib Vol 5, Pg No: 453)
Hadhrat Abu Juhaifah (May Allah be well pleased with him) says:
People would kiss His hands and rub them on their faces to gain blessings. I also took His hand and placed it on my face. I found that it was cooler than ice and more fragrant than musk.” (Sahih Bukhari Vol 1, Pg No: 502)
His hands' miraculous attribute was that wherever He (Sallallahu alaihi wa sallam) would place it, that place would be blessed forever. The blessings of His hand would heal diseases; remove troubles; dry udders of a goat would overflow with milk and streams of water would run forth from His fingers. A wave of His hand would split the moon into 2 and the set sun would return.
Hadhrat Aiz bin Amr (May Allah be well pleased with him) narrates,” In the Battle of Hunayn, an arrow got stuck in my forehead; because of it, blood kept flowing on my head and chest. The Holy Prophet (Sallallahu alaihi wa sallam) wiped the blood off my face and chest with His hands and prayed for me. The blessing of His hand was such that the area He touched became bright and radiant.” (Seerat halbiya Vol 2, Pg No: 128)
His fingers:
Hadhrat Anas (May Allah be well pleased with him) narrates, "When the Holy Prophet (Sallallahu alaihi wa sallam) was in Zaura, a vessel was brought to Him. When He (Sallallahu alaihi wa sallam) kept His hand in it, water started flooding out of His fingers. The Sahabah performed their ablutions with that water. Hadhrat Qatadah (May Allah be well pleased with him) says, I asked Anas (May Allah be well pleased with him) as to how many Sahabah were there? He replied, “300 or around 300.” (Sahih Bukhari Vol 1, Pg No: 504)
Hadhrat Jabir (May Allah be well pleased with him) says, "On the day of Hudaibiyah, the Sahabah felt very thirsty. A vessel was placed in front of the Holy Prophet (Sallallahu alaihi wa sallam). He (Sallallahu alaihi wa sallam) performed wudhu with it. The Sahabah came to Him. The Holy Prophet (Sallallahu alaihi wa sallam) asked, “What is the matter with you?” The Sahabah said: O Prophet of Allah (Sallallahu alaihi wa sallam) except the water in your vessel, there is nothing for us to perform wudhu with or to drink. The Holy Prophet (Sallallahu alaihi wa sallam) kept His hand in the vessel. Water started flooding out from His fingers like a stream. Hadhrat Jabir (May Allah be well pleased with him) says, “Then all of us drank from it and performed wudhu with it.” The narrator Hadhrat Salim (May Allah be well pleased with him) says: “I asked Hadhrat Jabir (May Allah be well pleased with him), “How many Sahabah were there?” Hadhrat Jabir (May Allah be well pleased with him) said: “It would have been sufficient for us even if we were a lakh. However, we were 1500.” (Sahih Bukhari Vol 2, Pg No: 598)
The Prophet of Allah (Sallallahu alaihi wa sallam) is extremely generous. He (Sallallahu alaihi wa sallam) would never let down any person because Allah has placed the keys of all the treasures in His hand and He (Sallallahu alaihi wa sallam) is the Disseminator and the holder of the treasures and Allah is the One who gives. Nobody would come back empty-handed from His door. The Lord Almighty says:
"Therefore treat not the orphan with harshness " Surah Zuha (93:09)
His benevolence was such that the one who asks would get over and above what he/she wanted. Hadhrat Anas (May Allah be well pleased with him) says, "Whatever He (Sallallahu alaihi wa sallam) was asked, He gave." Once the Holy Prophet (Sallallahu alaihi wa sallam) gave a person all the goats of a valley. That person went back and announced in his tribe: “O people embrace Islam, Muhammad (Sallallahu alaihi wa sallam) grants so much that there is no danger of starvation.” (Sahih Muslim Vol 2, Pg No: 253)
The flag of praise i.e. Liwa al Hamd will be in the hands of the Holy Prophet (Sallallahu alaihi wa sallam). Hadhrat Adam (Peace be upon him) and the entire creation will be under that flag." And the flag of praise will be in my hand and I am not proud because of it. Prophet Adam (Peace be upon him) and along with him every Prophet will be under my flag." (Zujajatul Masabeeh, Vol 5, Pg No: 15) Tirmidhi and Sunan Darmi, both have a Hadith: "The Holy Prophet (Sallallahu alaihi wa sallam), "On that day honor and the keys of heaven will be in My hand." (Sunan Darmi, muqaddima, Pg No: 24; Zujajatul Masabeeh, Vol 5, Pg No: 14)
The keys to heaven will be in the hands of the Holy Prophet (Sallallahu alaihi wa sallam) and He (Sallallahu alaihi wa sallam) will be the first one to knock at the doors of Jannah. There is Hadith: “And I will be the first one to get the doors of heaven opened.” (Sahih Muslim, Vol 1, Pg No: 112; Zujajatul Masabeeh Vol 5, Pg No: 18)