The Table Spread - 5:6
Believers! When you rise for prayer, wash your faces and your hands up to the elbows. Splash your head, and your feet up to the heels, and wash if you have had sexual intercourse. And if you are sick or a traveler, or you have come from the toilet, or you have had sexual intercourse with women and you cannot find water, then turn to a clean piece of earth and rub your face and arms with it. Allah does not wish to cause you any hardship. He only wants to purify you and complete His favor upon you. That you may give thanks.
What should we understand by the completion of our Lord's blessing upon us?
The Cow/2:150
Wherever you set out, turn your face towards the Holy Mosque (for prayer). Wherever you are, turn your faces towards it, so that the people may not criticize you. As for the wrongdoers, do not fear them, but fear Me, so that I may complete My favor upon you and you may reach the truth.
The Victory/48:2
That Allah may forgive you your sins, past and future, and complete His favor upon you, and guide you to the right path.