Exodus 12:8: That same night they are to eat the meat roasted over the fire, along with bitter herbs, and bread made without yeast.

Numbers 9:11: but they are to do it on the fourteenth day of the second month at twilight. They are to eat the lamb, together with unleavened bread and bitter herbs.

Lamentations 3:15: He has filled me with bitter herbs and given me gall to drink.