Or HaChaim on Exodus 6:7/אור החיים על שמות ו׳:ז׳

1 וידעתם כי אני ה׳ אלוקיכם, "you will know that I י־ה־ו־ה am the Lord your G'd." G'd means that the Israelites will now receive clear evidence which attribute of G'd it is that will set in motion the various steps of the redemption. They will also realise in retrospect that the attribute of Mercy had been predominant in all of G'd's actions.