﴿ فَإِن كُنتَ فِى شَكٍّۢ مِّمَّآ أَنزَلْنَآ إِلَيْكَ فَسْـَٔلِ ٱلَّذِينَ يَقْرَءُونَ ٱلْكِتَٰبَ مِن قَبْلِكَ ۚ لَقَدْ جَآءَكَ ٱلْحَقُّ مِن رَّبِّكَ فَلَا تَكُونَنَّ مِنَ ٱلْمُمْتَرِينَ ﴾

“AND SO, [O man,] if thou art in doubt about [the truth of] what We have [now] bestowed upon thee from on high, ask those who read the divine writ [revealed] before thy time: [and thou wilt find that,] surely, the truth has now come unto thee from thy Sustainer. Be not, then, among the doubters -”

Please check ayah 10:97 for complete tafsir.