Sahih Muslim 1620
Sahih Muslim · Book 24: The Book of Gifts · It Is Disliked For A Man To Buy What He Gave In Charity From The One To Whom He Gave It
وَحَدَّثَنَاهُ ابْنُ أَبِي عُمَرَ ، حَدَّثَنَا سُفْيَانُ ، عَنْ زَيْدِ بْنِ أَسْلَمَ ، بِهَذَا الإِسْنَادِ غَيْرَ أَنَّ مَالِكٍ وَرَوْحٍ أَتَمُّ وَأَكْثَرُ .
This hadith has been narrated on the authority of Zaid b. Aslam with the same chain of transmitters but with this (change) that the hadith transmitted on the authority of Malik and Rauh (he was the son of Qisirn) is more complete and lengthy.