12. After completing your dua, say aameen.

Abu Musabbih Al-Maqraaiy relates: On one occasion, we were seated by Abu Zuhair An-Numairi (radhiyallahu ‘anhu) who was from among the Sahaabah (radhiyallahu ‘anhum). He was most eloquent in speech. When anyone among us used to engage in dua, he would say, “Seal the dua with aameen, for aameen is like a stamp on the paper.” He then said further, “Should I not inform you regarding this? One night, we came out with Rasulullah (sallallahu ‘alaihi wasallam) and came across a person who was fervently engaged in dua. Rasulullah (sallallahu ‘alaihi wasallam) stopped to listen to him and said, ‘If he seals his dua, he will make Jannah binding for him.’ One of the people asked, ‘How should he seal it (his dua)?’ Rasulullah (sallallahu ‘alaihi wasallam) replied, ‘He should seal it with aameen? If he seals it with aameen, he has made Jannah binding for him.’ The one who had asked Rasulullah (sallallahu ‘alaihi wasallam) went up to the person and said, ‘O so and so, seal your dua with aameen and accept the glad tidings (of Rasulullah (sallallahu ‘alaihi wasallam)).’” ^[1]