1 Kings 18:43
He told his servant to look in the direction of the sea. After he looked the servant said: There is nothing. Elijah said: Go again seven times. So he went seven times.
Genesis 32:26
He said to him: Let me go now, for the dawn is near. But Jacob said: I will not let you go till you have given me your blessing.
Psalm 5:3
In the morning, O Jehovah, You will hear my voice. In the morning I will address my prayer to you and be on the watch.
Habakkuk 2:3
The vision is yet for the appointed time. It moves quickly to the end. It will not lie! If it delays, wait for it for it will surely come. It will not be late!
Luke 18:1
He spoke an illustration to them emphasizing the need to pray and not become tired:
Luke 18:7
Should God avenge his chosen that cry to him day and night, and yet he is longsuffering over them?
Ephesians 6:18
With prayer and supplication pray at all times in the Spirit. Watch with all perseverance and supplication for all the holy ones.
Hebrews 10:36-37
You need to persevere in order to do the will of God and receive what he promises.