Hi – lack of faith is obviously the big one. But here is a cross section to get you started. After this I’ll leave it up to you to research.
There are many more. Most have to do with our lack of faith. But look at those last few for instance. That last one from 1 Peter in particular is one a lot of guys tend to miss for some odd reason.
James 1:6 But let him ask in faith, with no doubting, for the one who doubts is like a wave of the sea that is driven and tossed by the wind. For that man ought not to expect that he will receive anything from the Lord,
Matthew 21:22 And whatever you ask in prayer, you will receive, if you have faith.”
Mark 11:24 Therefore I tell you, whatever you ask in prayer, believe that you have received it, and it will be yours.
Mark 11:22-24 And Jesus answered them, “Have faith in God. Truly, I say to you, whoever says to this mountain, ‘Be taken up and thrown into the sea,’ and does not doubt in his heart, but believes that what he says will come to pass, it will be done for him. Therefore I tell you, whatever you ask in prayer, believe that you have received it, and it will be yours.
Mark 9:23 And Jesus said to him, “‘If you can’! All things are possible for one who believes.”
Matthew 17:20 He said to them, “Because of your little faith. For truly, I say to you, if you have faith like a grain of mustard seed, you will say to this mountain, ‘Move from here to there,’ and it will move, and nothing will be impossible for you.”
Matthew 13:58 And He did not do many miracles there because of their
unbelief.
Mark 6:5 He could do no mighty work there, except that He laid His hands on a few sick people and healed them.
Hebrews 11:6 And without faith it is impossible to please him, for whoever would draw near to God must believe that he exists and that he rewards those who seek him.
Isaiah 1:15-16 When you spread out your hands, I will hide my eyes from you; even though you make many prayers, I will not listen; your hands are full of blood. Wash yourselves; make yourselves clean; remove the evil of your deeds from before my eyes; cease to do evil,
Psalm 66:18 If I had cherished iniquity in my heart, the Lord would not have listened.
Isaiah 59:2 But your iniquities have made a separation between you and your God, and your sins have hidden his face from you so that he does not hear.
James 4:3-10 You ask and do not receive, because you ask wrongly, to spend it on your passions. You adulterous people! Do you not know that friendship with the world is enmity with God? Therefore whoever wishes to be a friend of the world makes himself an enemy of God. Or do you suppose it is to no purpose that the Scripture says, “He yearns jealously over the spirit that he has made to dwell in us”? But he gives more grace. Therefore it says, “God opposes the proud, but gives grace to the humble.” Submit yourselves therefore to God. Resist the devil, and he will flee from you. ...
Mark 9:29 He said to them, “This kind cannot be driven out by anything but prayer and fasting.”
James 4:3 You ask and do not receive, because you ask wrongly, to spend it on your passions.
1 Peter 3:7 Likewise, husbands, live with your wives in an understanding way, showing honor to the woman as the weaker vessel, since they are heirs with you of the grace of life,
so that your prayers may not be hindered.