1 Samuel 20:15

But also thou shalt not cut off thy kindness from my house
for ever
His family should partake of it as well as himself:

no, not when the Lord hath cut off the enemies of David, everyone
from the face of the earth;
Saul and his sons, and everyone that should oppose his settlement in the kingdom: Jonathan's meaning is, that the covenant between them should not be only between them personally, but include their posterity, as follows.