Hadhrat Uthman - Excellence and eminence

Hadhrat ‘Uthman (May Allah be well pleased with him) bought Jannah from the Holy Prophet (Sallallahu alaihi wa sallam)

Imam Hakim Neshapuri (May Allah shower His mercy on him) has narrated a Hadith in Mustadrak on the authority of Hadhrat Abu Hurairah (May Allah be well pleased with him):

Translation:  It has been narrated on the authority of Hadhrat Abu Hurairah (May Allah be well pleased with him), he said: Hadhrat ‘Uthman (May Allah be well pleased with him) has purchased Jannah twice from the Holy Prophet (Sallallahu alaihi wa sallam), one when he dug the spring of “Ma‘oona” and the second time, when he provided equipment to the army going to Tabook.

After this, Imam Hakim writes:  The chain of narration of this Hadith is Sahih (rigorously authenticated).  (Mustadarak ‘Alas Sahihain, Vol. 3, Pg. No. 107)