Often in the Bible (particularly the Hebrew portions) a certain figure of speech is used in which two extremes are given to represent the whole. I can't remember what it is called. Examples include things like:
He read this to the young and the old alike
Receive blessings from the heavens above and the depths beneath
Everyone shall eat the passover, both slave and free
Obey these laws in your going out and coming in, your rising and lying down
From Dan to Beersheba
Summer and Winter, Rain and Harvest
These are not literal citations but are examples similar to expressions commonly used. This idiomatic form of speech is just about everywhere when you think to look for it. But what is it called?