´It was narrated from Abu Hurairah that the Messenger of Allah (ﷺ) said:` “Allah (SWT) has been charitable with you over the disposal of one third of your wealth at the time of your death, so that you may be able to add to the record of your good deeds.”
Hadith Referenceسنن ابن ماجه / كتاب الوصايا / 2709
Hadith Gradingالألبانی:حسن | زبیر علی زئی:ضعيف, إسناده ضعيف, ضعفه البوصيري من أجل طلحة بن عمرو: متروك, وتابعه عقبة بن عبد اللّٰه الأصم عن عطاء عند أبي نعيم في الحلية (322/3) وعقبة ضعيف (تقريب: 4642), وللحديث طرق كلھا ضعيفة, انوار الصحيفه، صفحه نمبر 477
Hadith Takhrij«تفرد بہ ابن ماجہ ، ( تحفة الأ شراف : 14180 ، ومصباح الزجاجة : 961 ) ( حسن ) » ( سند میں طلحہ بن عمرو ضعیف راوی ہے ، لیکن حدیث شواہد کی وجہ سے حسن ہے )
➊ The mentioned narration has been declared weak in its chain of transmission by our esteemed researcher; however, some scholars have graded it as hasan (good) due to other supporting evidences. For details, see: (Al-Mawsu‘ah al-Hadithiyyah, Musnad al-Imam Ahmad: 45/475, 476, and Al-Irwa’, no. 1641). Therefore, the rulings of Islamic Shari‘ah are a source of benefit in both this world and the Hereafter.
➋ When a person makes a bequest (wasiyyah) for a good deed, the benefit for the deceased is that when his bequest is acted upon after his death, the reward for that deed reaches him.
➌ Even if the heirs do not act upon the bequest for a good deed, the deceased will still certainly receive the reward for making a good bequest.
Source: Commentary on Sunan Ibn Mājah by Mawlānā ‘Atā’ullāh Sājid, Page: 2709
Narrated Mu'adh bin Jabal (RA): The Prophet (ﷺ) said: "Allah gave (a favor) as Sadaqah to you a third of your property, when you are about to die, as an increase in your good deeds." [Reported by ad-Daraqutni]. Ahmad and al-Bazzar reported the aforesaid narration from the Hadith of Abu ad-Darda. While Ibn Majah reported it from the Hadith of Abu Hurairah (RA). All of them (i.e. these three chains of narrators) are weak. However, they may strengthen one another (becoming Hasan), and Allah Knows Best.