Two of the many great passages in the Bible that bring comfort and reassurance to the believer in times of distress are, first, here in Isaiah 41:8-10 where the Lord says this to His people.
8 But you, Israel, My servant,
Jacob, whom I have chosen,
the offspring of Abraham, My friend;
9 you whom I took from the ends of the earth,
and called from its farthest corners,
saying to you, “You are my servant,
I have chosen you and not cast you off”;
10 fear not, for I am with you;
be not dismayed, for I am your God;
I will strengthen you, I will help you,
I will uphold you with my righteous right hand.