Musannaf Ibn Abi Shayba 7:145

Khalid ibn Makhlad narrated to us, he said: Abdullah ibn Ja’far narrated to us, from Umm Bakr bint al-Miswar, that al-Miswar heard a son of his saying something, so he said to him: "You have associated partners with Allah or you have disbelieved in Allah." Then he said: "Say, 'I seek forgiveness from Allah, I believe in Allah,' three times."