Bava Metzia

they are forbidden to zarim,  accounted as the priest's [personal] property,  are neutralised by one hundred and one [times their quantity].  and require washing of the hands  and the setting of the sun.  These provisions hold good of terumah and first fruits, which is not so in the case of [second] tithes.  Now, what is meant by 'which is not so in the case of [second] tithes?' Surely one may deduce that a tithe is neutralised by a greater quantity [than itself]:  but if Hezekiah's ruling is correct, it [the tithe] is an article which can become [otherwise] permitted, and whatever can become [otherwise] permitted is not neutralised even in a thousand [times its quantity]!  — But how do you know that 'which is not so in the case of the [second] tithe' means that it is neutralised by a greater quantity [than itself]; perhaps it means that it cannot be neutralised at all?  — You cannot say thus, because in respect of terumah only the stringencies of terumah are taught, not its leniencies.  But he teaches '[they] are accounted the priest's property!  — You cannot think so,  because it was distinctly taught: The second tithe is neutralized by a greater quantity [than itself]. And of which second tithe was this said? Of a tithe which is not worth a perutah  or which has once entered Jerusalem and gone forth again.  But if Hezekiah's ruling is correct, let Hezekiah's [remedy] be employed by redeeming it with the earlier money!  — It means that he has not [yet] redeemed [any other].  Then let him bring the other tithe [produce] which he has and combine them?  — That [which is tithe] by Biblical law and that which is [so] only by Rabbinic law cannot be combined.  Then let him bring demai!  — [We fear] lest he thereby bring certain [tithe].  Then let him bring two Perutahs, redeeming the tithe [that he brings] with a perutah and a half, and this [the intermixed tithe] with the rest?  — Do you think that one and a half perutah's worth of tithe consecrates  two perutahs? That is not so; one perutah['s worth] consecrates one Perutah, whilst the half perutah['s worth] does not consecrate [anything]; so again there is [tithe by] Biblical law  and [tithe by] Rabbinic law,  and these two cannot be combined. Then let an issar be brought?  — [That is forbidden,] lest he bring perutahs [for that purpose]. 'Or which has once entered Jerusalem and gone forth again.' But why so?  Let it be taken back again! — It refers to defiled [tithe]. Then let it be redeemed.  For R. Eleazar said: Whence do we know if second tithe [produce] became defiled, that it is to be redeemed