Shaarei Teshuvah
“And you shall eat no bread or parched grain or fresh ears until that very day” (Leviticus 23:14). And [until the day it becomes permitted], the new grain is forbidden by the Torah also outside of the Land.
Shenei Luchot HaBerit
Commandment 302 instructs us to offer the Omer offering of the new barley crop.