A look at the love of the brethren in 1 Peter & 1 John, Part One:
1 Peter 1:22–25 (ESV)
22 Having purified your souls by your obedience to the truth for a sincere brotherly love, love one another earnestly from a pure heart, 23 since you have been born again, not of perishable seed but of imperishable, through the living and abiding word of God; 24 for
“All flesh is like grass
and all its glory like the flower of grass.
The grass withers,
and the flower falls,
25 but the word of the Lord remains forever.”
And this word is the good news that was preached to you.