en_tn/psa/013/005.md

I have trusted in your covenant faithfulness

The abstract noun "faithfulness" can be translated as an adjective. Alternate translation: "I have trusted that you are faithful to your covenant" or "I have trusted you because you are faithful to your covenant" (See: rc://en/ta/man/translate/figs-abstractnouns)

my heart rejoices in your salvation

Here "my heart" represents the whole person. Alternate translation: "I will rejoice because you have rescued me" (See: rc://en/ta/man/translate/figs-synecdoche)