Daniel 10:12-13

12Then he said to me, ‘Daniel, do not be afraid. God has listened to your prayers since the time that you first turned to him. You wanted to understand about God. You put yourself under his authority. So I have come to bring the answer to your prayers.

13But the ruler of the kingdom of Persia stood against me for 21 days. Then Michael came to help me. He is one of God's most important angels. He helped me because the ruler of Persia was keeping me there.