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

• I saw ‘Ammār ibn Yāsir perform ablution, and he ran his fingers through his beard. It was said to him (or he said: I said to him): Do you run your fingers through your beard? He replied: What is there to prevent me if I have seen the Me...
• The Prophet (may Allah's peace and blessings be upon him) used to take a ritual bath with one Sā‘ up to five Mudds, and he used to perform ablution with one Mudd
• We used to prepare for the Messenger of Allah (may Allah's peace and blessings be upon him) his tooth-stick and the water he used for making ablution. Then, Allah would awaken him whenever He willed during the night, and he would brush his ...
• Perform ablution thoroughly, pass your fingers through each other, and snuff water well into your nostrils unless you are fasting