Let your conversation be without covetousness; and be content with such things as ye have: for he hath said, I will never leave thee, nor forsake thee. (Hebrews 13:5, KJV)
The text indicates that God (referenced in prior verse) has said this. But where in the Bible is it recorded? What seems to be a prayer asking for God to not leave nor forsake us can be found:
The LORD our God be with us, as he was with our fathers: let him not leave us, nor forsake us: (1 Kings 8:57, KJV)
...but making a request and making a declarative statement are not the same thing.
Wherein, therefore, can Hebrews 13:5 be shown to be true?