Musannaf Ibn Abi Shayba 1:1415

Yahya ibn Sa'id narrated to us, from Tariq the date-seed seller, who said: Munia bint Waqqas narrated to me, from her father, that Abu Musa used to sleep among them until he would snore. So they would wake him up, and he would say, "Have you heard me pass wind?" And we would say, "No." Then he would stand and pray.