It was narrated that 'Amr bin 'Ata' said: "I saw Sa'ib bin Yazid sniffing his garment, and I said: “Why (are you doing) that?' He said: “I heard the Messenger of Allah say: "No ablution (is needed) unless there is an odor or a sound””
SahihSahih LighairihiSahih LighairihiBook 1 · Hadith 250