Luke
Luke 11:8BSB·traditional attribution

I tell you, even though he will not get up to provide for him because of his friendship, yet because of the man’s persistence, he will get up and give him as much as he needs.

Matthew Henry Presbyterian @wholebiblehenry

Prayer is one of the great laws of natural religion. That man is a brute, is a monster, that never prays, that never gives glory to his Maker, nor feels his favour, nor owns his dependence upon him. One great design therefore of Christianity is to assist us in prayer, to enforce the duty upon us, to instruct us in it, and encourage us to expect advantage by it.

Commenting on Luke 11:1-13

John Gill Reformed Baptist @doctorgill

And I say unto you, ask, and it shall be given you,.... This is said by Christ, to encourage to prayer, and importunity in it; that if any one asks of God, in the name of Christ, and in faith, whether it be bread for the body, or food for the soul; or any blessing whatever, whether temporal or spiritual, it shall be given; not...

Albert Barnes Presbyterian @notesbybarnes

Verse 8. I tell you. The Latin Vulgate here adds, "if he shall continue knocking." Though this is not in the Greek, yet it is indispensable that it should be understood in order to the sense. Knocking once would not denote importunity, but it was because he continued knocking. His importunity. His troublesome perseverance; his continuing to disturb the man, and refusing to take any denial.