Sahih al-Bukhari, Volume 1, Book 12, Hadith 812 (USC-MSA) ⓘ
Narrated Ibn `Umar: During the holy battle of Khaibar the Prophet said, "Whoever ate from this plant (i.e. garlic) should not enter our mosque."
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 " .
also referenced under: Book 10, Hadith 244 (In-Book) & Hadith 853 (DarusSalam)