Deuteronomy 4:34

4:34 Or has God ever before tried to deliver a nation from the middle of another nation, accompanied by judgments, signs, wonders, war, strength, power, and other very terrifying things like the Lord your God did for you in Egypt before your very eyes?

Deuteronomy 21:17

21:17 Rather, he must acknowledge the son of the less loved wife as firstborn and give him the double portion of all he has, for that son is the beginning of his father’s procreative power – to him should go the right of the firstborn.