“Teach me a word that i can say.”

The Messenger (Sallallaahu `alayhi wa sallam) told him to say:

‘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.’

The desert Arab said,

“That is for my Lord, but what about me?”

The Prophet told him to say:

‘O Allah forgive me, and have mercy on me, and guide me, and provide for me.’

(Sahih Muslim 4/2072, Abu Dawud reports the same Hadith with the addition: and when the Arab left, The Prophet of Islam said: “He has filled his hands with goodness.” 1/220)

“Every son of Adam makes mistakes, and the best of those who make mistakes are those who repent”

(Ahmed, At-Tirmidhi and others)