How does 1 John 3:16 connect with John 15:13 on sacrificial love?

I have learned that references to the fact that Jesus laid down his life using the verb τίθημι --  tithémi  -- are unique to the Gospel of John (10:11, 15, 17, 18; 13:37, 38; 15:13) and 1 John (only here).

--1 John 3:16 "By this we know love, that d he laid down his life for us, and e we ought to lay down our lives for the brothers." 

-- John 15:13 --  "Greater love has no one than this, that someone lay down his life for his friends."

1 John 3:16 - 18

ESV - ¹⁶ By this we know love, that he laid down his life for us, and we ought to lay down our lives for the brothers. ¹⁷ But if anyone has the world's goods and sees his brother in need, yet closes his heart against him, how does God's love abide in him?

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