Rashi on Genesis 28:21/רש"י על בראשית כ״ח:כ״א

1ושבתי SO THAT I RETURN — even as He said (v. 15) “I will restore thee again into this land” (Genesis Rabbah 70:4),

2בשלום IN PEACE, perfectly free (שלם) from sin, not having learnt evil from Laban’s ways,

3והיה ה' לי לאלהים AND IF THE LORD WILL BE MY GOD, in that His Name shall rest upon me from the beginning to the end: that no unworthy person shall be found in my descendants (Sifré, ואתחנן 31) — just as it is said (v. 15), “I will do that which I spake concerning thee”; and this promise He made to Abraham, as it is said (17:7) “To be a God unto thee and unto thy seed after thee”,