Mukhtasar Bukhari (Abridged) 1391 — Description of Iblis and his army

Narrated by Abu Huraira (may Allah be pleased with him) from the Prophet (peace and blessings of Allah be upon him): "When any one of you wakes up from sleep and performs ablution, he should blow his nose three times, for the devil spends the night at the upper part of his nose."