Musannaf Ibn Abi Shaybah 16 — Saying Bismillah in ablution

Amrah said: I asked Sayyidah Aishah (may Allah be pleased with her) about the manner of the prayer of the Prophet (peace and blessings be upon him), and she said: "When the Prophet (peace and blessings be upon him) was about to perform ablution, he would first place his hand in the water and say 'Bismillah', then he would perform ablution, and he would perform a complete ablution in an excellent manner."