Sirach 5:11Ben Sira, Ecclesiasticus
9 Do not winnow in every wind, or follow every path. 10 Stand firm for what you know, and let your speech be consistent. 11 Be quick to hear, but deliberate in answering. 12 If you know what to say, answer your neighbor; but if not, put your hand over your mouth. 13 Honor and dishonor come from speaking, and the tongue of mortals may be their downfall. 14 Do not be called double-tongued and do not lay traps with your tongue; for shame comes to the thief, and severe condemnation to the double-tongued. 15 In great and small matters cause no harm,
Pirkei Avot 1:15Mishnah
15 Shammai used to say: make your [study of the] Torah a fixed practice; speak little, but do much; and receive all men with a pleasant countenance. 16 Rabban Gamaliel used to say: appoint for thyself a teacher, avoid doubt, and do not make a habit of tithing by guesswork. 17 Shimon, his son, used to say: all my days I grew up among the sages, and I have found nothing better for a person than silence. Study is not the most important thing, but actions; whoever indulges in too many words brings about sin.
Notes and References
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