Commentary for Exodus 4:22

ואמרת אל פרעה AND THOU SHALT SAY UNTO PHARAOH — When you perceive that his heart is stubborn and that he refuses to let them go speak to him thus:

בני בכורי ישראל, even though when it comes to the period known as קץ הימים, the end of the days of this planet, G’d will cause the kind of upheaval which will result in all the nations calling G’d by His chosen name and they will all serve Him without reservations, (Tzefaniah 3,9) even then Israel will still be special inasmuch as it is “My son.” I relate to Israel as a father relates to his son, not as a master relates to his servant, even the most benign of masters. A servant’s loyalty or “love” for his master is based on his expectations of reward, or his fear of punishment, not so a son’s loyalty and love. An additional reason for My preference for Israel is the fact that it is My firstborn son, i.e. it is the first nation to accept My position as Creator, King, Master in this universe. At a time when all the other nations were still following their misguided theologies, only the Jewish people proclaimed Me exclusively as their G’d and lawgiver. (compare Micah 4,5).

כה אמד ה׳ בני בכורי ישראל. Thus said the Lord: "Israel is My firstborn son." Why is this prophecy- i.e. that the Jewish firstborn would not be killed- recorded out of context, i.e. a long time before Moses would announce it to Pharaoh? We need to know also why, apparently, Moses was not to mention this to Pharaoh on their first encounter?