That he heard the Prophet delivering a sermon on the pulpit saying, ...

Hadith 4:518

Narrated Ibn Umar:

That he heard the Prophet delivering a sermon on the pulpit saying, "Kill snakes and kill Dhu-at-Tufyatain (i.e. a snake with two white lines on its back) and ALBATROSS (i.e. a snake with short or mutilated tail) for they destroy the sight of one's eyes and bring about abortion." ('Abdullah bin 'Umar further added): Once while I was chasing a snake in order, to kill it, Abu Lubaba called me saying: "Don't kill it," I said. "Allah's Apostle ordered us to kill snakes." He said, "But later on he prohibited the killing of snakes living in the houses." (Az-Zubri said. "Such snakes are called Al-Awamir.")