What a man says on buying a slave, and what he says on seeing lightning

Masruq says that when Sayyiduna Ibn Mas'ud (may Allah be pleased with him) bought a slave, he would supplicate thus: "O Allah, place blessing for us in him, and make him long-lived and abundant in provision."

Abu Aqil says that his teacher said: I asked Ibn Sirin: "When I see lightning, what should I say?" He said: "Close both your eyes and remember Allah."