Sforno on Genesis 17:7/ספורנו על בראשית י״ז:ז׳

1להיות לך לאלוקים ולזרעך אחריך, to accept Me as your exclusive deity, without any intermediary, just as G'd is the sold G'd of all the enduring phenomena in the world (the planets, stars, etc.) Solomon phrased it thus in Kohelet 3,14: כי כל אשר יעשה האלוקים הוא יהיה לעולם. According to our author this verse proves that anything which G'd has created without intermediary is eternal, endures, whereas when we see creatures and other phenomena disintegrate, this is proof that they were brought into existence by intermediaries of G'd, by His agents, not by Himself. Observing the terms of this covenant was concluded with G'd directly, not with an intermediary