Talmud for Sanhedrin 10:2
שְׁלֹשָׁה מְלָכִים וְאַרְבָּעָה הֶדְיוֹטוֹת אֵין לָהֶם חֵלֶק לָעוֹלָם הַבָּא. שְׁלֹשָׁה מְלָכִים, יָרָבְעָם, אַחְאָב, וּמְנַשֶּׁה. רַבִּי יְהוּדָה אוֹמֵר, מְנַשֶּׁה יֶשׁ לוֹ חֵלֶק לָעוֹלָם הַבָּא, שֶׁנֶּאֱמַר (דברי הימים ב לג) וַיִּתְפַּלֵּל אֵלָיו וַיֵּעָתֶר לוֹ וַיִּשְׁמַע תְּחִנָּתוֹ וַיְשִׁיבֵהוּ יְרוּשָׁלַיִם לְמַלְכוּתוֹ. אָמְרוּ לוֹ, לְמַלְכוּתוֹ הֱשִׁיבוֹ וְלֹא לְחַיֵּי הָעוֹלָם הַבָּא הֱשִׁיבוֹ. אַרְבָּעָה הֶדְיוֹטוֹת, בִּלְעָם, וְדוֹאֵג, וַאֲחִיתֹפֶל, וְגֵחֲזִי:
Three kings and four non-kings have no share in the world to come. Three kings: Yeravam, Achav, and Menasheh. R. Yehudah says: Menasheh has a share in the world to come, viz. (II Chronicles 33:13): "and he prayed to Him, and He was entreated of him, and He heard his supplication, and He returned him to Jerusalem to his kingdom." They countered: He was returned to his kingdom, but not to life in the world to come.] "Four non-kings": Bilam, Doeg, Achitofel, Gechazi. [("Three kings, etc.":) Even though they were great and wise, they have no share in the world to come, for their faith was not complete. And even though Bilam came from a different nation, and we learned: "All of Israel have a share in the world to come," because it is stated that the saints of the nations of the world have a share in the world to come, we are apprised that Bilam was not one of the saints of the nations of the world.]