Sayyiduna Abu Usayd (may Allah be pleased with him) narrates: I was sitting with the Prophet (peace and blessings be upon him) when a man from the Ansar came to him (peace and blessings be upon him) and said: "O Messenger of Allah, is there still any way left of honouring my parents after their death, by which I can do good to them?" He (peace and blessings be upon him) said: "Yes, four things: praying for mercy for them, seeking forgiveness for them, fulfilling their promises and bequests after their death, honouring their friend, and maintaining the ties of kinship that you have only through the two of them."
Hadith Referenceالمعجم الأوسط / باب الميم / 7976
Hadith Takhrij«أخرجه ابن حبان فى «صحيحه» برقم: 418، والحاكم فى «المستدرك» برقم: 7353، وأبو داود فى «سننه» برقم: 5142، وابن ماجه فى «سننه» برقم: 3664، والبيهقي فى «السنن الكبرى» برقم: 6994، 7202، وأحمد فى «مسنده» برقم: 16306، والطبراني فى «الكبير» برقم: 592»