"O people, you eat of two plants which I do not think are anything but bad, this onion and garlic. I have seen the Prophet of Allah ﷺ, if he noticed their smell coming from a man, ordering that he be taken out to Al-Baqi'. Whoever eats them, let him cook them to death."  

إِنَّكُمْ أَيُّهَا النَّاسُ تَأْكُلُونَ مِنْ شَجَرَتَيْنِ مَا أُرَاهُمَا إِلاَّ خَبِيثَتَيْنِ هَذَا الْبَصَلُ وَالثُّومُ وَلَقَدْ رَأَيْتُ نَبِيَّ اللَّهِ ﷺ إِذَا وَجَدَ رِيحَهُمَا مِنَ الرَّجُلِ أَمَرَ بِهِ فَأُخْرِجَ إِلَى الْبَقِيعِ فَمَنْ أَكَلَهُمَا فَلْيُمِتْهُمَا طَبْخًا