Saying Bismillah in ablution

It is narrated from Sayyiduna Abu Sa'id al-Khudri (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "Whoever does not mention the name of Allah Almighty before ablution (wudu) has no ablution."

Rabah bin Abd al-Rahman bin Abi Sufyan bin Huwaytib said: My grandmother told me that she heard her father say: I heard the Messenger of Allah (peace and blessings be upon him) say: "Whoever has not performed ablution (wudu) has no prayer, and whoever does not mention the name of Allah before ablution has no 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."

Bakr said: When a servant says "Bismillah" while performing ablution, his whole body becomes pure; and if he does not say "Bismillah", only the part that the water of ablution reached becomes pure.

Al-Hasan al-Basri said: A person should say Bismillah before performing ablution; but even if he does not say Bismillah, his ablution is still valid.