A desert Arab came to the Prophet of Allah (Sallallaahu `alayhi wa sallam) and said,
“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 …

The Prophet Muhammad (Sallallaahu `alayhi wa sallam) said,
“Every son of Adam makes mistakes, and the best of those who make mistakes are those who repent”