The Holy Quran 2:119 — Surah Al-Baqarah
Arabic text
إِنَّآ أَرْسَلْنَـٰكَ بِٱلْحَقِّ بَشِيرًا وَنَذِيرًا ۖ وَلَا تُسْـَٔلُ عَنْ أَصْحَـٰبِ ٱلْجَحِيمِ
Translation
Undoubtedly We have sent you (O Muhammad) with the truth, as a carrier of good news (to those who believe you) and as a warner (to those who refuse to believe you). You will not be questioned about the people of the Blaze (about those in the fire of Jahannam. Allaah shall not ask you why they did not believe because your duty is to give them the message and not to force them to believe).
Tafsir (excerpt) — Tafsir Usmani
That is, no blame lies on you for not making them Muslims.
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