Rashi on Deuteronomy 13:5/רש"י על דברים י״ג:ה׳

1ואת מצותיו תשמורו HIS COMMANDMENTS YE SHALL KEEP — the Law of Moses,

2ובקלו תשמעו HIS VOICE YE SHALL OBEY — the voice of the prophets,

3ואתו תעבדו HIM YE SHALL SERVE in His Temple (Sifrei Devarim 85:5).

4ובו תדבקון AND UNTO HIM YE SHALL CLEAVE — i.e. cleave to His ways: do kindly actions, bury the dead, visit the sick, as did the Holy One, blessed be He (Sotah 14a).