IN-49
What to say when slaughtering or sacrificing an animal
Bismillaahi wallaahu 'Akbar [Allaahumma minka wa laka] Allaahumma taqabbal minnee.
With the Name of Allah, Allah is the Most Great! [O Allah, from You and to You.] O Allah, accept it from me.
Reference: Muslim 3/ 1557, Al-Bayhaqi 9/287
What to say to foil the devil's plots
'A'oothu bikalimaatil-laahit-taammaatil-latee laa yujaawizuhunna barrun wa laa faajimn min sharri maa khalaqa, wa bara'a wa thara'a, wa min sharri maa yanzilu minas-samaa'i, wa min sharri maa ya'ruju feehaa, wa min sharri maa thara'a fil-'ardhi, wa min sharri ma yakhruju minhaa, wa min sharri fitanil-layli wannahaari, wa min sharri kulli taariqin 'illaa taariqan yatruqu bikhayrin yaa Rahmaan.
I seek refuge in the Perfect Words of Allah -which neither the upright nor the corrupt may overcome - from the evil of what He created, of what He made, and of what He scattered, from the evil of what descends from the heavens, and of what rises up to them, from the evil of what He scattered in the earth and of what emerges from it, from the evil trials of night and day, and from the evil of every night visitor, except the night visitor who comes with good. O Merciful One.
Reference: Ahmad 3/419, with an authentic chain of narration, and Ibn As-Sunni (no. 637). Al-Arna'ut, graded its chain authentic in his checking of Al-'Aqidah At-Tahawiyyah p. 133. See also Majma'uz-Zawa'id, 10/127