Luke 2:37
though she was now a widow, of about eighty-four years, who departed not from the temple, attending the divine service, with fastings and prayers night and day:
Luke 11:8-13
I tell you, though even he would not rise and give him because he is his friend; yet because of his importunity, roused up, he will give him as many as he needeth.
Luke 18:7
And shall not God execute vengeance for his own elect, who cry out to him day and night, though he bear long with them?
Ephesians 6:18
praying at every opportunity with all prayer and supplication in Spirit, and watching for this very purpose with perseverance and intercession for all the saints;