mercy. lovingkindness, or grace.
truth. faithfulness. Septuagint and Syriac read "Jehovah will deal with thee in lovingkindness and faithfulness".
Related Commentaries of 2 Samuel 15:20
2 Samuel 15:20
20 Whereas thou camest but yesterday, should I this day make thee go up and down with us? seeing I go whither I may, return thou, and take back thy brethren: mercy and truth be with thee.