Therefore I say unto you, What things soever ye desire, when ye pray, believe that ye receive them, and ye shall have them.
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Mark 11:22-26
Tyndale Open Study Notes (CC BY-SA 4.0).
11:24-25 Two additional sayings on prayer are tied to 11:23 by the word believe. In the first (11:24), we are told that we will receive what we ask for (see Matt 7:7) if we pray with the faith described in Mark 11:23. • Forgiveness is the second condition for answered prayer. Only when we forgive others can our most important prayer, that God forgive us, be answered (Matt 5:23-24; 6:12, 14-15; Luke 6:37; 11:4; cp. Luke 7:41-43, 47; Eph 4:32; Col 3:13).
Other Bible passages linked to this one, most cited first.
And all things, whatsoever ye shall ask in prayer, believing, ye shall receive.
And this is the confidence that we have in him, that, if we ask any thing according to his will, he heareth us: And if we know that he hear us, whatsoever we ask, we know that we have the petitions that we desired of him.
And whatsoever we ask, we receive of him, because we keep his commandments, and do those things that are pleasing in his sight.
If any of you lack wisdom, let him ask of God, that giveth to all men liberally, and upbraideth not; and it shall be given him. But let him ask in faith, nothing wavering. For he that wavereth is like a wave of the sea driven with the wind and tossed.
Again I say unto you, That if two of you shall agree on earth as touching any thing that they shall ask, it shall be done for them of my Father which is in heaven.
If ye abide in me, and my words abide in you, ye shall ask what ye will, and it shall be done unto you.
Authorship: the book itself or Christian tradition. Approximate dates, as in Carson and Moo, An Introduction to the New Testament, and Longman and Dillard, An Introduction to the Old Testament.