John 13:35

35Byἐνthisτούτῳwill knowγνώσονταιallπάντεςthatὅτιto Meἐμοὶdisciplesμαθηταίyou areἐστε,ifἐὰνloveἀγάπηνyou haveἔχητεamongἐνone anotherἀλλήλοις.

By this all will know that you⁺ are My disciples, if you⁺ shall have love among one another.”