Jeremiah 1:17-19 NIV

“Get yourself ready! Stand up and say to them whatever I command you. Do not be terrified by them, or I will terrify you before them. Today I have made you a fortified city, an iron pillar and a bronze wall to stand against the whole land—against the kings of Judah, its officials, its priests and the people of the land. They will fight against you but will not overcome you, for I am with you and will rescue you,” declares the Lord.

Matthew 10:16-20 NIV

“I am sending you out like sheep among wolves. Therefore be as shrewd as snakes and as innocent as doves. Be on your guard; you will be handed over to the local councils and be flogged in the synagogues. On my account you will be brought before governors and kings as witnesses to them and to the Gentiles. But when they arrest you, do not worry about what to say or how to say it. At that time you will be given what to say, for it will not be you speaking, but the Spirit of your Father speaking through you.

Exodus 3:10-15 NIV

So now, go. I am sending you to Pharaoh to bring my people the Israelites out of Egypt.” But Moses said to God, “Who am I that I should go to Pharaoh and bring the Israelites out of Egypt?” And God said, “I will be with you. And this will be the sign to you that it is I who have sent you: When you have brought the people out of Egypt, you[a] will worship God on this mountain.” Moses said to God, “Suppose I go to the Israelites and say to them, ‘The God of your fathers has sent me to you,’ and they ask me, ‘What is his name?’ Then what shall I tell them?” God said to Moses, “I am who I am.[b] This is what you are to say to the Israelites: ‘I am has sent me to you.’” God also said to Moses, “Say to the Israelites, ‘The Lord,[c] the God of your fathers—the God of Abraham, the God of Isaac and the God of Jacob—has sent me to you.’ “This is my name forever,  the name you shall call me from generation to generation.

2 Corinthians 12:7-10 NIV

or because of these surpassingly great revelations. Therefore, in order to keep me from becoming conceited, I was given a thorn in my flesh, a messenger of Satan, to torment me. Three times I pleaded with the Lord to take it away from me. But he said to me, “My grace is sufficient for you, for my power is made perfect in weakness.” Therefore I will boast all the more gladly about my weaknesses, so that Christ’s power may rest on me. That is why, for Christ’s sake, I delight in weaknesses, in insults, in hardships, in persecutions, in difficulties. For when I am weak, then I am strong.