فَإِن كُنتَ فِي شَكّٖ مِّمَّآ أَنزَلۡنَآ إِلَيۡكَ فَسۡـَٔلِ ٱلَّذِينَ يَقۡرَءُونَ ٱلۡكِتَٰبَ مِن قَبۡلِكَۚ لَقَدۡ جَآءَكَ ٱلۡحَقُّ مِن رَّبِّكَ فَلَا تَكُونَنَّ مِنَ ٱلۡمُمۡتَرِينَ ٩٤
So if you are in doubt, [O Muḥammad], about that which We have revealed to you, then ask those who have been reading the Scripture before you. The truth has certainly come to you from your Lord, so never be among the doubters.
Translation: Saheeh International (English)
Each word's meaning and sound
If you, O Messenger, are in doubt or confusion about the reality of the Qur’ān that I have revealed to you, then ask those Jews who read the Torah and the Christians who read the Gospel to confirm it. They will tell you that what was revealed to you is the truth because they have the description of it in their scriptures. The truth, about which there is no doubt, has come to you from your Lord, so do not be of those who have doubt.
Al-Mukhtasar in interpreting the Noble Quran