Two are better than one, because they have a good reward for their labor. For if they fall, one will lift up his companion. But woe to him who is alone when he falls for he has no one to help him up.
Ecclesiastes 4:9-10 New King James Version
Rejoice with those who rejoice, weep with those who weep.
Rom 12:15 New King James Version

Faithful are the wounds of a friend,
But the kisses of an enemy are deceitful.
Prov 27:6 New King James Version

As soon as 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. And Saul took him that day and would not let him return to his father's house anymore. Then Jonathan made a covenant with David, because he loved him as his own soul.
1 Samuel 18:1-3 New King James Version