Ben Sira 8:18

18 In the presence of a stranger do nothing that is to be kept secret, for you do not know what he will divulge.

Ben Sira 8:18 In-Context

16 Do not fight with a wrathful man, and do not cross the wilderness with him; because blood is as nothing in his sight, and where no help is at hand, he will strike you down.
17 Do not consult with a fool, for he will not be able to keep a secret.
18 In the presence of a stranger do nothing that is to be kept secret, for you do not know what he will divulge.
19 Do not reveal your thoughts to every one, lest you drive away your good luck.
Revised Standard Version of the Bible, copyright 1952 [2nd edition, 1971] by the Division of Christian Education of the National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved.