כִּי֩ מֵֽאַהֲבַ֨ת יְהוָ֜ה אֶתְכֶ֗ם וּמִשָּׁמְר֤וּ אֶת־הַשְּׁבֻעָה֙ אֲשֶׁ֤ר נִשְׁבַּע֙ לַאֲבֹ֣תֵיכֶ֔ם הוֹצִ֧יא יְהוָ֛ה אֶתְכֶ֖ם בְּיָ֣ד חֲזָקָ֑ה וַֽיִּפְדְּךָ֙ מִבֵּ֣ית עֲבָדִ֔ים מִיַּ֖ד פַּרְעֹ֥ה מֶֽלֶךְ־מִצְרָֽיִם׃
kundi dahil sa pagmamahal ng Walang-Hanggan sa inyo, at dahil sa pagtupad Niya sa sumpang Kanyang isinumpa sa inyong mga ninuno, kaya kayo inilabas ng Walang-Hanggan sa pamamagitan ng makapangyarihang kamay, at tinubos ka Niya mula sa bahay ng pagkaalipin, mula sa kamay ni Faraon na hari ng Egipto.
Rashi
כי מאהבת — Here, however, you have the word כי used in the sense of “but": NOT ON ACCOUNT THAT YE WERE MORE NUMEROUS … DID GOD DELIGHT IN YOU … BUT ON ACCOUNT OF THE LORD'S LOVE TO YOU.
Sforno
כי מאהבת ה' אתכם, seeing that you are the seed of someone who loved Him and who was more familiar with His name than any member of any of the other nations.
Siftei Chakhamim
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ומשמרו את השבועה means, on account of His keeping the oath.