Luke 1:20
And now you shall be silent and unable to speak until the day when this takes place, because you did not believe what I said, though my words will be fulfilled in due course."
Luke 1:37
For no promise from God shall fail to be fulfilled."
Luke 18:27
But Jesus said: "What is impossible with men is possible with God."
Romans 4:20-21
He was not led by want of faith to doubt God's promise.
Romans 6:19-21
I can but speak as men do because of the weakness of your earthly nature. Once you offered every part of your bodies to the service of impurity, and of wickedness, which leads to further wickedness. Now, in the same way, offer them to the service of Righteousness, which leads to holiness.