While we were with the Messenger of Allah! ﷺ a man of Banu Salmah came to Him and said: Messenger of Allah is there any kindness left that I can do to my parents after their death? He replied: Yes, you can invoke blessings on them, forgiveness for them, carry out their final instructions after their death, join ties of relationship which are dependent on them, and honour their friends.  

بَيْنَا نَحْنُ عِنْدَ رَسُولِ اللَّهِ ﷺ إِذَا جَاءَهُ رَجُلٌ مِنْ بَنِي سَلِمَةَ فَقَالَ يَا رَسُولَ اللَّهِ هَلْ بَقِيَ مِنْ بِرِّ أَبَوَىَّ شَىْءٌ أَبَرُّهُمَا بِهِ بَعْدَ مَوْتِهِمَا قَالَ نَعَمِ الصَّلاَةُ عَلَيْهِمَا وَالاِسْتِغْفَارُ لَهُمَا وَإِنْفَاذُ عَهْدِهِمَا مِنْ بَعْدِهِمَا وَصِلَةُ الرَّحِمِ الَّتِي لاَ تُوصَلُ إِلاَّ بِهِمَا وَإِكْرَامُ صَدِيقِهِمَا  

"While we were with the Prophet ﷺ, a man from the Banu Salamah came to him and said: " O messenger of Allah, is there anyway of honoring my parents that I can still do for them after they die?' He said: "Yes offering the funeral prayer for them, praying for forgiveness for them, fulfilling their promises after their death, honoring their freinds and upholding the ties of kinship which you would not have were it nor for them.'"  

بَيْنَمَا نَحْنُ عِنْدَ النَّبِيِّ ﷺ إِذْ جَاءَهُ رَجُلٌ مِنْ بَنِي سُلَيْمٍ فَقَالَ يَا رَسُولَ اللَّهِ أَبَقِيَ مِنْ بِرِّ أَبَوَىَّ شَىْءٌ أَبَرُّهُمَا بِهِ مِنْ بَعْدِ مَوْتِهِمَا قَالَ نَعَمْ الصَّلاَةُ عَلَيْهِمَا وَالاِسْتِغْفَارُ لَهُمَا وَإِيفَاءٌ بِعُهُودِهِمَا مِنْ بَعْدِ مَوْتِهِمَا وَإِكْرَامُ صَدِيقِهِمَا وَصِلَةُ الرَّحِمِ الَّتِي لاَ تُوصَلُ إِلاَّ بِهِمَا