Hadith 10:56
Abu Bakr narrated to us, he said: Ibn Abi Ghuniyah narrated to us, from his father, from al-Hakam, regarding a man who takes back his wife and does not call witnesses. He said: He should call witnesses to her return.
حدثنا أبو بكر قال نا بن [ أبي غنية ] عن أبيه عن الحكم في رجل يراجع امرأته ولا يشهد قال فليشهد على رجعتها