John Gill Commentary 2 John 1:5

"And now I beseech thee, lady, not as though I wrote to thee a new commandment, but that which we had from the beginning, that we love one another." — 2 John 1:5 (ASV)

And now I beseech you, lady
Or "Kyria", which word the Syriac and Arabic versions retain, as if it was a proper name: the apostle having finished the inscription, salutation, and congratulation in the preceding verses, passes to an exhortation and entreaty to observe the commandment of love to one another, which is not a new commandment, but what was from the beginning:

not as though I wrote a new commandment (See Gill on 1 John 2:7) and (See Gill on 1 John 2:8).