Psalms 66:18 "If I have seen wickedness in my heart, YHWH would not hear."

Proverbs 15:29 "YHWH is far from the wrong ones, But He hears the prayer of the righteous."

John 9:31 "And we know that Elohim does not hear sinners. But if anyone fears Elohim and does His desire, He hears him."

1 John 3:22 "And whatever we ask we receive from Him, because we guard His commands and do what is pleasing in His sight."

1 John 4:13 "And this is the boldness that we have in Him, that if we ask whatever according to His desire, He hears us."

James 4:3 "You ask and do not receive, because you ask evilly, in order to spend it on your pleasures."

Mark 11:23-26 (v:23) "For truly, I say to you, whoever says to this mountain, 'Be removed and be thrown into the sea,' and does not doubt in his heart, but believes that what he says, shall be done, he shall have whatever he says." (v:24) "Because of this I say to you, whatever you ask when you pray, believe that you receive them, and you shall receive them." (v:25) "And whatever you stand praying, if you hold whatever against anyone, forgive, so that your Father in the heavens shall also forgive you your trespasses." (v:26) "But if you do not forgive, neither shall your Father in the heavens forgive your trespasses."

John 15:7 "If you stay in Me, and My Words stay in you, you shall ask whatever you wish, and it shall be done for you."

Luke 11:9-10 (v:9) "And I say to you: ask and it shall be given to you, seek and you shall find, knock and it shall be opened to you." (v:10) "For everyone asking receives, and he who is seeking finds, and to him who is knocking it shall be opened."

Ephesians 6:18 "praying at all times, with all prayer and supplication in the Spirit, watching in all perseverance and supplication for all the set-apart ones."

Philippians 4:6 "Do not worry at all, but in every matter by prayer and petition, with thanksgiving, let your requests be made known to Elohim."

1 Peter 4:7-8 (v:7) "But the end of all has drawn near. Therefore be sober-minded, and be attentive in the prayers." (v:8) "And above all have fervent love for one another, because love covers a great number of sins."

2 Chron 30:18-20 - demonstates YHWH's mercy when one prays for mercy.