Look
'Look not back behind thee,' as in Genesis 19:17, means that Lot, who represents the good of charity, should not look to matters of doctrine. 'To look up,' is to look to celestial things. In Genesis 18:22, looking signifies thinking because seeing denotes understanding.
(Notae: Arcana Coelestia 2245)
Genesis 17:11
11
You shall be circumcised in the flesh of your foreskin. It will be a token of the covenant between me and you.