I end this discussion with those immensely beautiful words, which were the last words uttered by the Holy Founder of Islām in a world of materialism. Ḥaḍrat ‘Alī bin Abī Ṭālib(ra) and Anas bin Mālik(ra) relate:
Meaning, “The last words which were heard upon the blessed tongue of the Holy Prophet(sa) in a state when death was about to overtake him were 
, meaning, ‘O ye Muslims! My last testament to you is that you must never forget my teaching relevant to the obligatory prayers and slaves.’”1
At the time when the Holy Prophet(sa) uttered these words, his wives who stood by his side in every difficulty and hardship as his life partners were also present. His beloved daughter and her children, as well as other friends and relatives of the Holy Prophet(sa) were also before him. The loyal Muhājirīn, in whose sincere companionship the life of the Holy Prophet(sa) had passed were present as well. The devoted Anṣār, who irrigated the plant of Islām by the water of their blood were also nearby. Moreover, this was a time when the Holy Prophet(sa) would not have had any further opportunity to advise anyone else. The Holy Prophet(sa) also knew and felt that an admonition made at such a time would outweigh all other exhortations. Yet, the eyes of the Holy Prophet(sa) did not settle upon any one of the people mentioned just now. If there was a single person in the world who the Holy Prophet(sa) remembered and this recollection made him uneasy even in his final moments before death, it was this immensely oppressed slave. Goodness gracious! What a true friend of slaves. What a compassionate and sincere friend was bestowed upon the world by God, but alas, the world did not give him his due value.
1 Sunanu Ibni Mājah, Kitābul-Waṣāyā, Bābu Hal Auṣā Rasūlullāh(sa), Ḥadīth No. 2697
Al-Jāmi‘uṣ-Ṣaghīru Fī Aḥādīthil-Bashīrin-Nadhīr, By Al-Imām Jalāluddīn bin Abī Bakr As-Suyūṭī, Volume 1-2, p. 319, Ḥadīth No. 5172, Dārul-Kutubil-‘Ilmiyyah, Beirut, Lebanon (2004)