Cross reference
Genesis 18:29
29 He spoke to him yet again, and said, "What if there are forty found there?" He said, "I will not do it for the forty's sake."
Ephesians 6:18
18 with all prayer and requests, praying at all times in the Spirit, and being watchful to this end in all perseverance and requests for all the saints:
Hebrews 4:16
16 Let us therefore draw near with boldness to the throne of grace, that we may receive mercy, and may find grace for help in time of need.