That they shall not touch thee, so as to offer any incivility or injury to thee. Touching is oft taken for hurting, Genesis 26:11 Psalms 105:15.
Related Commentaries of Ruth 2:9
Ruth 2:9
9 Let thine eyes be on the field that they do reap, and go thou after them: have I not charged the young men that they shall not touch thee? and when thou art athirst, go unto the vessels, and drink of that which the young men have drawn.