But Peter said, “Man, I do not know what you are talking about.” Immediately, while he was still speaking, a rooster crowed.The Lord turned and looked at Peter. And Peter remembered the word of the Lord, how He had told him, “Before a rooster crows today, you will deny Me three times.” (Luk 22:60–61)
Satan desired to sift Peter like wheat in order to permanently collapse Peter’s faith. Our Lord prayed that Peter’s faith would not fail. Jesus allowed Peter to be sifted in order to collapse Peter’s pride.
Consider what I say, for the Lord will give you understanding in everything. (2 Tim 2:7)