فَإِن كُنتَ فِى شَكٍّ مِّمَّآ أَنزَلْنَآ إِلَيْكَ فَسْـَٔلِ ٱلَّذِينَ يَقْرَءُونَ ٱلْكِتَـٰبَ مِن قَبْلِكَ ۚ لَقَدْ جَآءَكَ ٱلْحَقُّ مِن رَّبِّكَ فَلَا تَكُونَنَّ مِنَ ٱلْمُمْتَرِينَ
fa-in kunta fī shakkin mimmā anzalnā ilayka fasali alladhīna yaqraūna l-kitāba min qablika laqad jāaka l-ḥaqu min rabbika falā takūnanna mina l-mum'tarīna
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.
— Saheeh International
So if you [Prophet] are in doubt about what We have revealed to you, ask those who have been reading the scriptures before you. The Truth has come to you from your Lord, so be in no doubt
— M. A. S. Abdel Haleem
So if you (O Muhammad صلى الله عليه وسلم) are in doubt concerning that which We have revealed unto you, [i.e. that your name is written in the Taurât (Torah) and the Injeel (Gospel)], then ask those who are reading the Book [the Taurât (Torah) and the Injeel (Gospel)] before you. Verily, the truth has come to you from your Lord. So be not of those who doubt (it).
— Muhammad Muhsin Khan & Muhammad Taqi-ud-Din al-Hilali