You shall surely give him, and your heart shall not be grieved when you give to him, because for this thing Hashem your God will bless you in all your work and in all that you put your hand to.
English: "Because of this thing" — A teaching of the school of Rabbi Yishmael: "because of this thing (davar)"—it is a wheel that turns in the world. From here Rabbi Elazar HaKappar said: A person should always pray for mercy concerning this measure, for if it does not come upon him it may come upon his son, and if not upon his son then upon his grandson.
On the daf / in context: Poverty is a revolving wheel; the one who gives today may need to receive tomorrow.
Type of Learning
Derash on the verse (Shabbos) — poverty is a turning wheel.
What Is Learned
One should pray for mercy regarding poverty, because the wheel of fortune turns and the giver of today may become the recipient of tomorrow.