Abu Hurayrah (may Allah be pleased with him) reported that the Messenger of Allah (may Alla's peace and blessings be upon him) judged the prayer of a person who did not perform ablution to be invalid, and so is the ablution of a person who did not mention the name of Allah at its start. The Hadīth clearly states that that it is compulsory to mention Allah's name when beginning ablution. Therefore, intentionally leaving it invalidates one's ablution. However, leaving it out of ignorance or forgetfulness does not invalidate it.

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2. Jurisprudence and Juristic Principles
3. Jurisprudence of Acts of Worship
4. Purification
5. Ablution
6. Recommended Acts and Manners of Ablution
7. Hadith

• There is no Muslim who performs ablution well and then stands and prays two Rak‘ahs while focused on them with his heart and his face, except that Paradise will be guaranteed for him
• The Prophet (may Allah’s peace and blessings be upon him) performed ablution by washing the body parts twice
• Were it not that I would cause difficulty for my followers, I would command them to use the tooth-stick with every prayer
• In the time of the Prophet (may Allah's peace and blessings be upon him) we would not find such food except rarely. So if we found it, we had no napkins except our palms, forearms, and feet. Then we would pray without making (a new) ablutio...