# When you reap your harvest in your field

"When you cut down the grain in your field"

# an omer of grain

Some versions translate this as "a sheaf." This refers to stalks of grain, enough to carry and tie in a bundle.

# it must be for the foreigner, for the fatherless, or for the widow

"you must leave the sheaf so a foreigner, an orphan, or a widow can take it" 

# in all the work of your hands

"in all the work that you do"