Now when he had finished speaking to Saul, the soul of Jonathan was knit to the soul of David, and Jonathan loved him as his own soul.
1 Samuel 14:6 NKJV
Then Jonathan said to the young man who bore his armor, “Come, let us go over to the garrison of these uncircumcised; it may be that the Lord will work for us. For nothing restrains the Lord from saving by many or by few.”
“He [Jonathan] loved him [David] as his very self.”
1 Samuel 18:1,3
1 Samuel 18:3–4 NKJV
Then Jonathan and David made a covenant, because he loved him as his own soul. And Jonathan took off the robe that was on him and gave it to David, with his armor, even to his sword and his bow and his belt.