[This is the law] if a person sins [in any of the following ways]:
If he is bound by an oath [to give evidence in court], where he was a witness who saw or knew [something], and he does not testify, he must bear his guilt.
Venefesh ki-techeta veshame'ah kol alah vehu ed o ra'ah o yada im-lo yagid venasa avono.
Commentary:
bound Or, 'accepts an oath;' literally 'hears a dread oath' (see Sifra; Shevuoth 30a; Yad, Shevuoth 1:12).
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