GEN1221 Why did our forefathers earn the right to this world, to the Messianic era, and to the world to come? – because they habituated themselves to giving charity.   …   Isaac was praised for his charity, as it is said [this verse] and sowing indicates charity, as it is said Hosea 10:12: “Sow for yourselves in charity.” (The connection is that just as a man longs to sow his field, even though, at the time, he merely casts his seed on the ground-he is nevertheless confident that it will yield a hundredfold later on – so should one long to give charity, and be just as confident that God will repay many times over for the small loss of capital suffered at present, as it is said Deuteronomy 15:10: “You shall surely give … for on account of this thing God will bless you.”  AHAVCH 155