Albert Barnes Commentary Ezekiel 16:8

"Now when I passed by thee, and looked upon thee, behold, thy time was the time of love; and I spread my skirt over thee, and covered thy nakedness: yea, I sware unto thee, and entered into a covenant with thee, saith the Lord Jehovah, and thou becamest mine." — Ezekiel 16:8 (ASV)

Now when ... - Or, Then I passed by you ... and behold. The betrothal of the young woman represents God’s entering into covenant with the people in the wilderness at Mt. Sinai (Exodus 34:27).