Ulangan 31:6

31:6 Be strong and courageous! Do not fear or tremble before them, for the Lord your God is the one who is going with you. He will not fail you or abandon you!”

Ibrani 13:6

13:6 So we can say with confidence, “The Lord is my helper, and ¹  I will not be afraid. What can man do to me?” ² 

[13:6]  ¹ tc Some important mss (א* C* P 0285^vid 33 1175 1739 pc lat) lack καί (kai), but because the omission conforms to the wording of Ps 118:6 (117:6 LXX), it is suspect.

[13:6]  ² sn A quotation from Ps 118:6.