Sforno on Genesis 39:2/ספורנו על בראשית ל״ט:ב׳

1ויהי ה' את יוסף, to save him from anyone who would take advantage of him.

2ויהי איש מצליח, he achieved every venture that he set out to accomplish.

3ויהי בבית אדוניו המצרי, he would perform tasks in his master’s private room. The meaning of the word היה here is the same as the meaning of the word עמד elsewhere, i.e. stationed, remaining in a fixed position. Examples of the word היה occurring in this sense are found in Deuteronomy 31,26 והיה שם, “it would remain there.” Compare also Deuteronomy 10,5 ויהיו שם כאשר צוני ה', “they remained there as the Lord had commanded me.”