—all of them. As the Prophet ﷺ said in an authentic hadith:

“No servant is ever afflicted with anxiety or sorrow and says, ‘O Allah, I am Your servant, the son of Your servant and Your maidservant. My forelock is in Your hand. Your judgment concerning me is carried out, and Your decree concerning me is just. I ask You by every name belonging to You, by which You have named Yourself, revealed in Your Book, taught to any of Your creation, or kept exclusively in Your knowledge of the unseen, to make the magnificent Quran the springtime of my heart, the light of my breast, the removal of my sorrow, and the departure of my anxiety and distress,’ but Allah removes his anxiety and distress and replaces them with joy.” They asked, “O Messenger of Allah, should we not learn these words?” He replied, “Yes indeed. Whoever hears them should learn them.” «1»

The supplicant is therefore encouraged to ask Allah Most High by His names and attributes, as in the supplication containing the Greatest Name:

“O Allah, I ask You by virtue of all praise belonging to You. There is no god but You, the Most Compassionate, the Bestower of blessings, the Originator of the heavens and the earth. O Possessor of Majesty and Honour, O Ever-Living, All-Sustaining!” «2»

These words encompass the Most Beautiful Names, as explained elsewhere. «3»

Supplication is of three kinds.

The first is to ask Allah Most High by His names and attributes. This is one of the two interpretations of His words:

“To Allah belong the Most Beautiful Names, so call upon Him by them.” (7:180)

The second is to appeal to Him through your need, poverty, and humility, saying, for example: “I am Your needy, destitute, wretched, lowly servant, seeking refuge with You.”

The third is to ask for what you need without mentioning either of these two things.

The first is more complete than the second, and the second more complete than the third. When a supplication combines all three, it is the most complete.