Fear thou not; for I am with thee: be not dismayed; for I am thy God: I will strengthen thee; yea, I will help thee; yea, I will uphold thee with the right hand of my righteousness.
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Isaiah 41:8-12
Tyndale Open Study Notes (CC BY-SA 4.0).
41:10 I am with you: The promise of God’s presence (see 7:14) is central to the Bible. Because God is present, his people do not need to fear (see also 43:1-2, 5). • I am your God: The Lord used the language of the covenant to affirm that he is their God and that they are his people (see also Jer 7:23; 31:1, 33; Ezek 14:11; 36:28; 37:27; Zech 8:8). • hold you . . . my victorious right hand: The Lord used language reminiscent of the Exodus (cp. Exod 15:6) to encourage Israel (see also Isa 41:13; 63:12).
Other Bible passages linked to this one, most cited first.
Have not I commanded thee? Be strong and of a good courage; be not afraid, neither be thou dismayed: for the LORD thy God is with thee whithersoever thou goest.
But now thus saith the LORD that created thee, O Jacob, and he that formed thee, O Israel, Fear not: for I have redeemed thee, I have called thee by thy name; thou art mine. When thou passest through the waters, I will be with thee; and through the rivers, they shall not overflow thee: when thou walkest through the fire, thou shalt not be burned; neither shall the flame kindle upon thee.
What shall we then say to these things? If God be for us, who can be against us?
Be strong and of a good courage, fear not, nor be afraid of them: for the LORD thy God, he it is that doth go with thee; he will not fail thee, nor forsake thee. And Moses called unto Joshua, and said unto him in the sight of all Israel, Be strong and of a good courage: for thou must go with this people unto the land which the LORD hath sworn unto their fathers to give them; and thou shalt cause them to inherit it. And the LORD, he it is that doth go before thee; he will be with thee, he will not fail thee, neither forsake thee: fear not, neither be dismayed.
I can do all things through Christ which strengtheneth me.
He giveth power to the faint; and to them that have no might he increaseth strength. Even the youths shall faint and be weary, and the young men shall utterly fall: But they that wait upon the LORD shall renew their strength; they shall mount up with wings as eagles; they shall run, and not be weary; and they shall walk, and not faint.
Authorship: the book itself or Christian tradition. Approximate dates, as in Carson and Moo, An Introduction to the New Testament, and Longman and Dillard, An Introduction to the Old Testament.