Sahih al-Bukhari 853
Sahih al-Bukhari · Book 10: Call to Prayers (Adhaan) · What has been said about uncooked garlic, onion and leek.
Narrated Ibn `Umar:
حَدَّثَنَا مُسَدَّدٌ ، قَالَ حَدَّثَنَا يَحْيَى ، عَنْ عُبَيْدِ اللَّهِ ، قَالَ حَدَّثَنِي نَافِعٌ ، عَنِ ابْنِ عُمَرَ ـ رضى الله عنهما ـ أَنَّ النَّبِيَّ صلى الله عليه وسلم قَالَ فِي غَزْوَةِ خَيْبَرَ " مَنْ أَكَلَ مِنْ هَذِهِ الشَّجَرَةِ ـ يَعْنِي الثُّومَ ـ فَلاَ يَقْرَبَنَّ مَسْجِدَنَا " .
During the holy battle of Khaibar the Prophet (ﷺ) said, "Whoever ate from this plant (i.e. garlic) should not enter our mosque."