Hebrews 12:11

But no chastisement seems, at the time, to be a matter of joy, but of grief: yet afterward, it yields the peaceable fruit of righteousness to those who are exercised by it.

Matthew 10:37

He that loves father or mother more than me, is not worthy of me: and he that loves son or daughter more than me, is not worthy of me:

Treasury of Scripture Knowledge

Summary

And the thing was very grievous in Abraham's sight because of his son.

Bible References

Because

Matthew 10:37
He that loves father or mother more than me, is not worthy of me: and he that loves son or daughter more than me, is not worthy of me:
Hebrews 12:11
But no chastisement seems, at the time, to be a matter of joy, but of grief: yet afterward, it yields the peaceable fruit of righteousness to those who are exercised by it.