Messenger of Allah [PBUH] said:

“وأنَا تارِكٌ فيكُم ثَقَلَينِ: أوَّلُهُما كتابُ اللّهِ فيهِ الهُدى والنّورُ، فَخُذوا بِكتابِ اللّهِ واستَمسِكوا بِهِ. فَحَثَّ عَلى كِتابِ اللّهِ ورَغَّبَ فيهِ، ثُمَّ قالَ: وأهلُ بَيتي “

I leave to precious things to you. {1} divine book {Quran}, there is guidance and light in it so, take it and resort to it. So, Prophet Muhammad [PBUH] has encouraged people toward Quran. Then he said: {2} my “Ahl al-Bayt”.

“Sahih Muslim” – vol. 4, p 837