Nachschlagewerk zu Jirmejahu 30:31

ובגוים לא יתחשב AND SHALL NOT RECKON ITSELF AMONG THE NATIONS — Understand this as the Targum does — They will not be exterminated with the other nations, as it is said, ( 30:11) “For I will make a full end of all the nations [… but I will not make a full end of thee]”. The words therefore mean: They do not come under the same reckoning (לא יתחשב) with other nations. — Another explanation is: When they rejoice, no other nation rejoices with them, as it is said, (Deuteronomy 32:12) “The Lord will lead him alone to future bliss”, and when the nations are in prosperity they (the Israelites) eat with each one of them and yet it is not taken into account or them thereby to diminish their reward in the future life; and this is the meaning of ובגוים לא יתחשב (“and when they enjoy with the nations it is not taken into account) (Midrash Tanchuma, Balak 12).