Q 52: What is the textual proof of the Most Beautiful Names of Allah from the Glorious Qur'an and the Prophetic Sunnah?
A--- Almighty Allah says: {And (all) the Most Beautiful Names belong to Allah, so call on Him by them, and leave the company of those who belie or deny (or utter impious speech against)
His Names}. (Al-A' rat, 180)
Allah says: {Say (O Muhammad (Peace be upon him)): "Invoke Allah or invoke the Most Gracious (Allah), by whatever name you invoke Him (it is the same), for to Him belong the Best Names}.
Allah says: {Allah! La ilaha illa Huwa (none has the right to be worshipped but He)! To Him belong the Best Names}. (Ta-Ha, 8)
Allah's Messenger (Peace be upon him) says: "Allah has ninety-nine Names, i.e., one hundred minus one, and whoever believes in their meanings and acts accordingly, will enter Paradise,. and Allah is Witr (one) and loves 'the Wit’ (i.e., odd numbers).”(Bukhari and Muslim)
He (Peace be upon him) says: "I ask You with all Your Names, whether You called Yourself therewith, or You revealed in Your Book, or You made known to one of Your Creatures, or You kept unseen with You, (I ask You with all these) to make the Glorious Qur'an the spring for my heart".
(Imam Ahmed)
Reference: 200 FAQ On Muslims Belief - Shiekh Hafiz Ibn Ahmed Al Hakami