Sayyiduna Ibn Abbas (may Allah be pleased with them both) said: Injustice and causing harm in a bequest are among the major sins.
The correct version is this one, mawquf (a statement of the Companion); Ibn Uyaynah and others likewise narrated it from Dawud as mawquf. It has also been narrated through another route as marfu' (attributed to the Prophet), and attributing it to him is da'if (weak).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الوصايا / 12587
Hadith Gradingمحدثین:صحيح
Hadith Takhrij«صحيح۔ اخرجه سعيد بن منصور 342۔ 344»