Shulchan Aruch

Is one permitted to benefit from the proceeds if one's chametz was sold to a non-Jew?

One may not benefit from the proceeds of chametz sold to a non-Jew

If one's non-Jewish servant purchases items in exchange for chametz after the sixth hour, is the transaction valid?

Chametz does not take effect as a medium of exchange; goods acquired for chametz are permitted

Should one place a stone under their head and sleep on the ground on the night of Tisha b'Av?

There are those accustomed to sleep spread on the ground and place a stone under their heads on the …