"The thigh was considered the source of posterity in the ancient world. Or, more properly, the “loins” or the testicles. The phrase “under the thigh” could be a euphemism for “on the loins.” There are two reasons why someone would take an oath in this manner: 1) Abraham had been promised a “seed” by God, and this covenantal blessing was passed on to his son and grandson. Abraham made his trusted servant swear “on the seed of Abraham” that he would find a wife for Isaac. 2) Abraham had received circumcision as the sign of the covenant (Genesis 17:10). Our custom is to swear on a Bible; the Hebrew custom was to swear on circumcision, the mark of God’s covenant. The idea of swearing on one’s loins is found in other cultures, as well. The English word testify is directly related to the word testicles."

https://www.gotquestions.org/hand-under-thigh.html

People swore oaths in their testicles. The words testimony, testes, and testament all have the same root. Thus the Bible is composed of old balls and new balls.

Edit: spelling.

"Swear on my balls"

I'm sure it's totally inno--

Oh

"All I have in this world is my balls and my word."

That's as close to relevant as I can get.

I mean my dick is under my knees so Abraham was packin' pea shooters.

"Who is this guy, and what is he doing in my court ?"

"He is the witness in this trial, your Honor".

"Does that mean the ball is now in my court?"

"Yep".

I mean the Bible in general is written in old language and meaning. Could it mean to support him and shoulder him as he grows older and can’t walk? Taking anything literally from the Bible tends to look strange as society has evolved over thousands of years since then

So Israel was a person in Genesis?

We have truly lost our way. Nobody sits on anyone's hands anymore.