The Salah al-Khusama is done, so that the reward of it is donated to all people whom you have harmed and sinned against, so that Allah ta’ala will use the reward to satisfy their claims on the Day of Resurrection, if He so wills.In short it is a prayer to avert claims by those we have aggrieved on the Day of Judgement.. It is a 4 raka’at prayer, done at one go with one salam(Taslim) at the end, it is perfomed preferably between Zuhur prayers and Asar. It appears in al-Ghunya at-Talibi fee Tariq al-Haqq of Wali Allah Shaykh Abd al-Qadir al-Jilani (q.s.) which he taught to his disciples.
It is done as follows:
1st raka’at: Surah al-Fatihah 1 time, followed by Surah al-Ikhlas 11 times
2nd raka’at: Surah al-Fatihah 1 time, followed by Surah al-Ikhlas 10 times, and Surah al-Kafiroon, 3 times
3rd raka’at: Surah al-Fatihah 1 time , followed by Surah al-Ikhlas 10 times, and Surah al-Takathur 1 time. [Surah al-Takathur is Surah number 102]
4th raka’at: Surah al-Fatihah 1 time, followed by Surah al-Ikhlas 15 times, and Ayatul Kursi 1 time.
Then donate the spiritual reward of the performance of this prayer, to all those enemies(adversaries in litigation) who will have a claim against you on Judgement Day, al-khusama, so that Allah ta’ala may satisfy their claim on the Day of Resurrection, Yawm al-Qiyamah, if Allah (s.w.t.) so Wills.
This salah(prayer) may be performed on 7 specific occasions:
1st: On the first night of Rajab;
2nd: On the night of the middle of Sha’ban,(15th Sha’ban, Shab e Barat)
3rd: On the last Friday of Ramadhan; (alwida Juma’ah)
4th: On Eid ul Fitr (1st Shawwal)
5th: On Eid ul Adha (10th Zulhijjah)
6th: On the Day of Arafah; (9th Zulhijjah) and;
7th: On the day of Ashura (1oth Muharram)