Concerning Jacob who became Israel:

"And Jacob loved Rachel; and said, I will serve thee seven years for Rachel thy younger daughter. And Laban said, It is better that I give her to thee, than that I should give her to another man: abide with me. And Jacob served seven years for Rachel; and they seemed unto him but a few days, for the love he had to her."
Genesis 29:18-20

"This is my commandment, That ye love one another, as I have loved you."
John 15:12