Hebrews 12:11

Now no discipline seems for the present to be joyous, but grievous; but afterward it yields the peaceable fruits of righteousness to those who have been trained under it.

Matthew 10:37

"He who loves father or mother more than me is not worthy of me; and he who 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 who loves father or mother more than me is not worthy of me; and he who loves son or daughter more than me is not worthy of me;
Hebrews 12:11
Now no discipline seems for the present to be joyous, but grievous; but afterward it yields the peaceable fruits of righteousness to those who have been trained under it.