Sahih Muslim Book 4, Hadith Number 1148.

Chapter : When food is brought before man and he is inclined to take it, he should not say prayer before eating it and undesirability of prayer while feeling the call of nature.

Ibn Juraij has narrated it with the same chain of transmitters: He who eats of this plant, i.e. garlic, should not come to us in our mosque, and he made no mention of onions or leek.