'Promise' in the Bible

Then they summoned the man who used to be blind a second time and said to him, "Promise before God to tell the truth. We know that this man is a sinner."

Jesus said to her, “Did I not say to you that if you believe [in Me], you will see the glory of God [the expression of His excellence]?”

At that time you will make your requests in my name; and I do not promise to ask the Father on your behalf,