What can we learn from the story of the Prophet Muhammad (peace be upon him) leading us in five rak'ahs of prayer, and then later realizing he had forgotten and offering two prostrations as compensation of forgetfulness?
 'Abdullah (b. Mas'ud) reported:                      The Messenger of Allah (may peace be upon him) led us five (rak'ahs in prayer). We said: Messenger of Allah, has the prayer been extended? He said: What is the matter? They said: You have said five (rak'ahs). He (the Holy Prophet) said: Verily I am a human being like you. I remember as you remember and I forget just as you forget. He then performed two prostrations as (compensation of) forgetfulness.