Sahih Muslim 562
Sahih Muslim · Book 5: The Book of Mosques and Places of Prayer · Prohibiting one who has eaten garlic, onions, or leeks, and other things that have an offensive odor from coming to the masjid, until that smell has gone away, and such a person should be expelled from the masjid
Ibn Suhaib reported:
وَحَدَّثَنِي زُهَيْرُ بْنُ حَرْبٍ ، حَدَّثَنَا إِسْمَاعِيلُ، - يَعْنِي ابْنَ عُلَيَّةَ - عَنْ عَبْدِ الْعَزِيزِ، - وَهُوَ ابْنُ صُهَيْبٍ - قَالَ سُئِلَ أَنَسٌ عَنِ الثُّومِ، فَقَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " مَنْ أَكَلَ مِنْ هَذِهِ الشَّجَرَةِ فَلاَ يَقْرَبَنَّا وَلاَ يُصَلِّي مَعَنَا " .
Anas was asked about the garlic; he stated that the Messenger of Allah (ﷺ) had said: He who eats of this plant (garlic) should not approach us and pray along with us.