Rashi on Genesis 26:5/רש"י על בראשית כ״ו:ה׳

1שמע אברהם בקלי ABRAHAM HEARKENED TO MY VOICE when I put him to the test.

2וישמר משמרתי AND KEPT MY CHARGE — This refers to precautionary measures which are intended to make us avoid the infringement of Biblical prohibitions: such are the Rabbinical inhibition of marriage between relatives in the second degree and the Rabbinical regulations regarding not doing certain acts on the Sabbath (cf. Yevamot 21a).

3מצותי MY COMMANDMENTS — those matters which, had they not been written in the Torah, we would nevertheless hold that they are fitting matters to be the subject of a commandment, such as robbery and murder (cf. Yoma 67b).

4חקותי MY ORDINANCES — matters which our evil inclination and the heathen nations argue against the necessity of prohibiting, such as the eating of swine’s flesh and the wearing of garments made of a mixture of wool and linen — things for which there are no apparent reasons but which are the King’s decrees and enactments imposed on His subjects (Yoma 67b).

5ותורתי AND MY LAWS — The plural serves to include with the written Law also the Oral Law which prescribes commands that are an ancient institution given by God to Moses from Sinai (cf. Genesis Rabbah 64:4).