Imam Ja'far-as-Sadiq (A.
Imam Ja'far-as-Sadiq (A.S.) says, “For a person who gives clothes to his pother believer during the summer or in winter, it is incumbent upon Allah to present the dress of Paradise to him, make his end easy, and save him from the narrowness of the grave.” The Holy Prophet (S.A.W.S.) says, “A person who offers to eat something sweet to his pother believer, the pangs of death will be easy on him”.
Those A’mal which prove beneficial during death and eases it’s tribulations: Reciting Surah-al-Yaseen, Surah-as-Saffat and the following supplication (du'a) eases the tribulation during death: لا إلهَ إلاّ الله الحَليمُ الكَريمُ. لا إلهَ إلاّ الله العَلِيِّ العَظيمُ.
One of it's merits is that when the Angel of death comes to remove his spirit (Rooh), he comes in the form of a handsome youth carrying a bowl of the pure drink (Sharabe Tahoora) and offers him to drink. The dying person does so and dies in peace. The Holy Prophet (S.A.W.S.) says that if a person recites four unit (Rak'at) Namaz on the night of 7th Rajab in a manner that in each unit (Rak'at) after Surah-al-Hamd recites thrice Surah-at-Tawheed, once Surah-al-Falaq, and once Surah-an-Naas.
After finishing the Namaz, sends Salawat on Us and recites ten times Tabeehate Arba. سُبْحانَ اللهِ وَالحَمدُ للهِ وَلا إلهَ إلاّ اللهُ واللهُ أكْبَرُ Almighty Allah will offer him shelter under the Throne (Arsh), and give him reward of a person fasting in the month of Ramazan. Till the time he finishes the prayers, the Angels pray for his forgiveness. Allah will ease the pangs of death on him, and save him from the squeeze in the grave (Fishare Qap).
He will not die until he sees his place in Paradise, and will be safe from the hardships of Resurrection (Qayamat). Shaikh Kaf'ami quotes from the Holy Prophet (S.A.W.S.), that he said that a person who recites the following supplication (Du'a) 10 times daily, Allah ill forgive four thousand major sins (Gunahane Kabeera) of his, offer him refuge from one lac calamities at the time of death, the squeeze in the grave (Fishare Qap) & Qayamat.