عَنْ عَبْدِ اللَّهِ بْنِ عَمْرِو بْنِ الْعَاصِ رَضِيَ اللَّهُ عَنْهُمَا قَالَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ لَا أَخَافُ عَلَى أُمَّتِي إِلَّا اللَّبَنَ فَإِنَّ الشَّيْطَانَ بَيْنَ الرَّغْوَةِ وَالصَّرِيحِ
Narrated by Sayyiduna Abdullah bin Amr ibn al-As (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "What I fear most for my Ummah is the matter of milk, because Satan is between pure milk and its froth."