we have

Exodus 9:27, 28
Then Pharaoh summoned Moses and Aaron. "This time I have sinned, " he said. "The LORD is righteous, and I and my people are wicked. . . .

1 Samuel 12:19
They pleaded with Samuel, "Pray to the LORD your God for your servants, so we will not die! For we have added to all our sins the evil of asking for a king."

1 Samuel 15:24, 30
Then Saul said to Samuel, "I have sinned; I have transgressed the LORD's commandment and your instructions, because I feared the people and obeyed their voice. . . .

Psalm 78:34
When He slew them, they would seek Him; they repented and searched for God.

Matthew 27:4
"I have sinned by betraying innocent blood, " he said. "What is that to us?" they replied. "You bear the responsibility."

pray

Exodus 8:8, 28
Pharaoh summoned Moses and Aaron and said, "Pray to the LORD to take the frogs away from me and my people. Then I will let your people go, that they may sacrifice to the LORD." . . .

1 Kings 13:6
Then the king responded to the man of God, "Intercede with the LORD your God and pray that my hand may be restored." So the man of God interceded with the LORD, and the king's hand was restored to him as it was before.

Jeremiah 37:3
Yet King Zedekiah sent Jehucal son of Shelemiah and Zephaniah the priest, the son of Maaseiah, to Jeremiah the prophet with the message, "Please pray for us to the LORD our God!"

Acts 8:24
Then Simon answered, "Pray to the Lord for me, so that nothing you have said may happen to me."

James 5:16
Therefore confess your sins to each other and pray for each other so that you may be healed. The prayer of a righteous man has great power to prevail.

and Moses

Numbers 11:2
And the people cried out to Moses, and he prayed to the LORD, and the fire died down.

Numbers 14:17-20
So now I pray, may the power of the Lord be magnified, just as You have declared: . . .

Genesis 20:7
Now return the man's wife, for he is a prophet; he will pray for you and you will live. But if you do not restore her, be aware that you will surely die--you and all who belong to you."

Exodus 32:11, 30
But Moses entreated the LORD his God, saying, "O LORD, why does Your anger burn against Your people, whom You brought out of the land of Egypt with great power and a mighty hand? . . .

Deuteronomy 9:20, 26-29
The LORD was angry enough with Aaron to destroy him, but at that time I also prayed for Aaron. . . .

1 Samuel 12:20-23
"Do not be afraid, " Samuel replied. "Even though you have committed all this evil, do not turn aside from following the LORD, but serve the LORD with all your heart. . . .

Job 42:8, 10
So now, take seven bulls and seven rams, go to My servant Job, and sacrifice a burnt offering for yourselves. Then My servant Job will pray for you, for I will accept his prayer and not deal with you according to your folly. For you have not spoken accurately about Me, as My servant Job has." . . .

Psalm 106:23
So He said He would destroy them--had not Moses His chosen one stood before Him in the breach to divert His wrath from destroying them.

Jeremiah 15:1
Then the LORD said to me: "Even if Moses and Samuel should stand before Me, My heart would not go out to this people. Send them from My presence, and let them go.

Romans 10:1
Brothers, my heart's desire and prayer to God for the Israelites is for their salvation.