The scholars differed concerning the ruling on saying Bismillaah in wudu’.Imam Ahmad was of the view that it is obligatory, and he quoted as evidence the hadith narrated from the Prophet(PBUH), according to which he said: “There is no wudu’ for the one who does not mention the name of Allah. ” The majority of scholars – including Imam Abu Haneefah, Imam Maalik and Imaam al - Shaafa’i – and according to one view narrated from Imam Ahmad, are of the view that saying Bismillaah is one of the Sunnahs of wudu’, and that it is not obligatory. They quoted evidence for its not being obligatory, such as: 1 – The Prophet(AS) taught a man how to do wudu’, and said to him: “Do wuduo’ as Allah has commanded you. ”(Narrated by al - Tirmidhi, 302; classed as saheeh by al - Albaani in Saheeh al - Tirmidhi, 247). This is referring to the words of Allah(interpretation of the meaning):“O you who believe! When you intend to offer As - Salaah(the prayer), wash your faces and your hands(forearms) up to the elbows, rub(by passing wet hands over) your heads, and(wash) your feet up to the ankles”[al - Maa ' idah 5:6] And there is no mention of saying Bismillaah in what Allah commands here. See al-Majmoo’ by al-Nawawi, 1/346 Abu Dawood (856) narrated a more complete version of this hadith, which more clearly demonstrates that it is not obligatory to say Bismillaah when doing wudoo’. It was narrated from Abu Hurayrah that the Messenger of Allah (peace and blessings of Allah be upon him) said: The prayer of any one of you is not complete unless he does wudu’ properly as enjoined by Allah. So he should wash his face and his hands up to the elbows, and wipe his head, and wash his feet up to the ankles…” The Prophet (peace and blessings of Allah be upon him) did not mention saying Bismillaah, which indicates that it is not obligatory. See al-Sunan al-Kubra by al-Bayhaqi, 1/44 2 – Many of those who described the wudu’ of the Prophet (peace and blessings of Allah be upon him) did not mention that he said Bismillaah; if it was obligatory it would have been mentioned. See al-Sharh al-Mumti’, 1/130 This is the view favored by many of the Hanbalis such as al-Khuraqi and Ibn Qudaamah. See al-Mughni, 1/145; al-Insaaf, 1/128 Among contemporary scholars, this view is favored by Shaykh Muhammad ibn Ibraaheem and Muhammad ibn ‘Uthaymeen (may Allah have mercy on them both). See: Fataawa al-Shaykh Muhammad ibn Ibraaheem, 2/39; al-Sharh al-Mumti’, 1/130, 300) They responded in two ways to the hadith which is quoted by those who say that saying Bismillaah is obligatory: 1 – That the hadith is da’eef (weak). It was classed as da’eef by a number of scholars including Imam Ahmad, al-Bayhaqi, al-Nawawi and al-Bazzaar. Imam Ahmad was asked about saying Bismillaah when doing wudoo’, and he said: There is no sound hadith concerning that, and I do not know of any hadith that has a jayyid (good) isnaad to support that. Al-Mughni, 1/145 See al-Sunan al-Kubra by al-Bayhaqi, 1/43; al-Majmoo’, 1/343; Talkhees al-Habeer, 1/72 2 – If the hadith is saheeh, then what it means is “no perfect wudu’” and not “no valid wudoo’”. See al-Majmoo’, 1/347; al-Mughni, 1/146 Based on this, then the hadith – if it is saheeh – indicates that it is mustahabb to say Bismillaah, but it is not obligatory. And Allah knows best. Based on this, if a Muslim does wudoo’ and does not say Bismillaah, then his wudu’ is valid, but he is missing out on the reward for doing this Sunnah. To be on the safe side, the Muslim should not omit to say Bismillaah when doing wudu’.