Anas bin Mālik (raḍiy Allāhu ‘anhu) narrated that the Prophet ﷺ traces of yellow perfume on ʿAbdur Rahmān bin ʿAwf, and he asked him “What is this?” He said: “O Messenger of Allah, I married a woman for the weight of a stone of gold. He said [the above] and then said: “Give a feast even if it is only with one sheep.” (Ibn Mājah 1907)
ʿAmr b. Shuʿayb (raḍiy Allāhu ‘anhu) narrated from his father that his grandfather (ʿAbdullah b. ʿAmr ibn al-ʿAs) narrated the Prophet ﷺ saying: “If one of you marries a woman or buys a slave girl, he should say: [the above]. If he buys a camel, he should take hold of the top of its hump and say the same.”
According to another narration he said: “Then he should take hold of her forelock and supplicate for blessing in the woman or the slave girl.” (Abū Dāwūd 2160)
Ibn ʿAbbās (radiy Allāhū ‘anhumā) narrated that the Messenger of Allah ﷺ said: “If any one of you goes to his wife and says [the above]. If a child is decreed for them Shaytān will not harm him.” (Bukhārī 141)
Ibn ʿAbbās (radiy Allāhū ‘anhumā) narrated that the Messenger of Allah ﷺ used to seek Allah’s protection for Ḥasan and Ḥusayn (radiy Allāhū ʿanhumā) and say: “Your forefather (i.e. Ibrāhīm) used to seek refuge with Allah for Ismaʿīl and Isḥāq by reciting the [the above].” (Bukhārī 3371)
Jābir (radiy Allāhū ‘anhu) narrates that the Messenger of Allah ﷺ said: “When the evening comes, keep your children in, for the devils come out at that time. Then when part of the night has passed, let them go. And close the doors and mention the name of Allah, for Shaytān does not open a closed door. Tie up your waterskins and mention the name of Allah. Cover your vessels, even if you only put something over them and extinguish your lamps.” (Bukhārī 3280)
Commenting on the above hadīth, Ibn Hajar (raḥimahullāh) quotes Ibn al-Jawzī (raḥimahullāh): ‘‘There is a fear for children at that hour, because the impurity (najāsah) that the devils (shayātīn) surround themselves with is usually found in children.
Similarly, children do not usually engage in the dhikr which would protect them. And when the devils spread out, they hang on to whatever they can hang on to. Hence there is a fear for children at that time.
The reason why they spread out at that time is that they are more able to move about at night than during the day, because darkness is more conducive to the devil forces coming together than any other time.’ (Fath al-Bārī)