Charles H. Spurgeon on Psalms 109:7

Let his prayer become sin. As the clamours of a condemned malefactor, not only find no acceptance, but are looked upon as an affront to the court. The prayers of the wicked now become sin, because soured with the leaven of hypocrisy and malice; and so they will in the great day, because then it will be too late to cry, "Lord, Lord, open unto us." —Matthew Henry.