We may reap for the benefit of the saplings, for a place of mourning, [and] in order to [avoid] a cessation of study. He may not make them into bundles; rather, he leaves them in heaps. The commandment of the omer is that it should come from standing grain; if he did not find, he may bring from the sheaves. Its commandment is that it come from the fresh; if he did not find, he may bring from the dry. Its commandment is that it be reaped by night; if it is reaped by day it is valid. And it overrides the Sabbath.