29 For God never goes back upon his gifts and call.
Romans 11:29 Cross References - Moffatt
Romans 8:28
28 We know also that those who love God, those who have been called in terms of his purpose, have his aid and interest in everything.
Hebrews 7:21
21 Previous priests became priests apart from any oath, but he has an oath from Him who said to him, The Lord has sworn, and he will not change his mind, thou art a priest for ever.