The prayer of Shab Bara'at is not rejected
Translation of Hadith: It has been narrated on the authority of Hadhrat Abdullah bin Umar (May Allah SWT be well pleased with them), he said that there are 5 blessed nights in which a prayer is not rejected:
1. The night of Friday (i.e. the night before Friday i.e. Thursday night, same for all nights)
2. The first night of Rajab.
3. The 15th night of Sha'aban.
4. The night of Eid Ul Fitr.
5. The night of Eid Ul Azha.
(Shu'abul Iman, Hadith No: 3558)