Reference for Berakhot 126:20

אמר ר' שמואל בר נחמני מאי דכתיב (משלי ל, לב) אם נבלת בהתנשא ואם זמות יד לפה כל המנבל עצמו על דברי תורה סופו להתנשא ואם זמם יד לפה:

R. Samuel b. Nahmani said : What means that which is written, "If thou hast done foolishly in lifting up thyself, or if thou hast planned devices [zamam], lay thy hand upon thy mouth" (Prov. xxx. 32)? Everyone who makes himself foolish for the sake of words of Torah will in the end be lifted up ; but if he muzzles [zamam] his mouth, he will have to put his hand to his mouth.

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