I have made a covenant with my chosen, I have sworn unto David my servant,
Ver. 3. I have made a covenant with my chosen] i.e. With Christ (who is God's elect one, Isa 42:1), and in him with all his people, Ephesians 1:4 .
I have sworn unto David] The father and figure of Christ, who is frequently called David, and is here chiefly to be understood. O happy we, for whose sake God hath sworn! saith Tertullian; and O most wretched, if we believe him not thus swearing!