If only you listen to these laws, safeguarding and keeping them, then God your Lord will keep the covenant and love with which He made an oath to your fathers.
Vehayah ekev tishme'un et hamishpatim ha'eleh ushmartem va'asitem otam veshamar Adonay Eloheycha lecha et-habrit ve'et-hachesed asher nishba la'avoteycha.
Ekev in Hebrew; literally, 'because' (Rashi); 'as a reward, if' (Radak, Sherashim; Ibn Janach; Saadia; cf. Ramban); 'as a final result, if,' (Ibn Ezra; Chizzkuni; HaKethav VeHaKabbalah); or, 'it shall come to pass if' (Septuagint).
Some say that this section was said soon after the Exodus (Sifri). See note on Deuteronomy 6:4.
Some say the love the Israelites expressed toward God; cf. Jeremiah 2:2 (Midrash HaGadol).