The Messenger of Allah ﷺ said, "I fear two things for my nation, the Quran and milk. As for milk, they will seek out the countryside in pursuit of it, follow their desires, and abandon the prayers. As for the Quran, the hypocrites will learn it and use it to dispute with the believers."
حدثنا زيد بن الحباب حدثني أبو السمح حدثني أبو قبيل أنه سمع
إن رسول الله ﷺ قال إني أخاف على أمتي اثنتين القرآن واللبن أما اللبن فيبتغون الريف ويتبعون الشهوات ويتركون الصلوات وأما القرآن فيتعلمه المنافقون فيجادلون به المؤمنين
No references are available.
Its isnad is hasan because of Abu Samh, who is Darraj bin Saman, and he is acceptable. This has already come at the beginning of the Musnad of Anas, and the hadith has already appeared at 17346.