A desert Arab came to Allah’s Messenger (SAW) and said, “Teach me a word that I can say. ” The Prophet told him to say:
Laa ‘ilaaha ‘illallaahu wahdahu laa shareeka lahu, Allaahu ‘Akbaru kabeeran, walhamdu lillaahi katheeran, Subhaanallaahi Rabbil-‘aalameen, laa hawla wa laa quwwata ‘illaa biilaahil-‘Azeezil-Hakeem.
There is none worthy of worship but Allah , Who has no partner, Allah is the Great, the Most Great, and praise is to Allah in abundance, glory is to Allah, Lord of the worlds . There is no power and no might but by Allah the Mighty, the Wise.
He said, “That is for my Lord, but what about me?” The Prophet (SAW) told him to say:
Allaahummaghfir lee, warhamnee, wahdinee warzuqnee
O Allah forgive me, and have mercy on me and guide me, and provide for me.
Reference: Muslim 4/2072, Abu Dawud reports the same Hadith with the addition: and when the Arab left, the Prophet (SAW) said: “He has filled his hands with goodness.” 1/220.