Mukhtasar Muslim (Abridged) 150 — One who doubts passing wind during

Abu Huraira (may Allah be pleased with him) reports that the Messenger of Allah (peace and blessings be upon him) said: When any one of you feels a disturbance in his stomach during prayer, and he is unsure whether anything has come out of him or not, that is, whether wind has been passed or not, he should not leave the mosque until he hears a sound or perceives a smell (i.e., until he is certain that he has broken his wudu).