Narrated Mu'awiyah ibn Qurrah: The Messenger of Allah (ﷺ) forbade these two plants (i.e. garlic and onions), and he said: He who eats them should not come near our mosque. If it is necessary to eat them, make them dead by cooking, that is, onions and garlic
SahihSahihSahih LighairihiBook 28 · Hadith 92