What do we pray for in the sixth petition?

Answer

In the sixth petition, which is, And lead us not into temptation but deliver us from evil (), we pray that God would either keep us from being tempted to sin (), or support and deliver us when we are tempted ().

Read the 3 proof texts (KJV)

Matthew 6:13: And lead us not into temptation, but deliver us from evil: For thine is the kingdom, and the power, and the glory, for ever. Amen.
Matthew 26:31: Then saith Jesus unto them, All ye shall be offended because of me this night: for it is written, I will smite the shepherd, and the sheep of the flock shall be scattered abroad.
2 Corinthians 12:8: For this thing I besought the Lord thrice, that it might depart from me.