In the name of Allah, Most Gracious, Ever Merciful
Though written by unknown individuals, there are some prophecies of interest in the article below, which may serve as a starting point for those interested in researching the subject further:
It is stated that Hassan ibn Thabit r.a. referred to the Holy Prophet Muhammad s.a. as Mahdi in a poem. This should not at all be surprising in that Prophets are referred to as 'Imams who Guided' in the Noble Qur'an [21:73, 32:24]. They guided others because they were Guided by Allah s.w.t., and hence are Imam Mahdi's. Who other than Muhammad s.a. is 'The Imam Mahdi', par excellence?
I was having a discussion with a christian colleague who stated the usual polemical argument that Muhammad s.a. is Dead and buried, whilst Jesus a.s. is Alive and will Return. I said to him that the muslims are waiting for Muhammad s.a. to return as well. He was shocked to hear this, upon which I told him that the Imam al Mahdi is the return of Muhammad s.a. himself. I meant this in the sense that his s.a. great, noble and deeply spiritual teachings would be revived, and according to one prophecy, the Ummah will become great.
(Source: Mustadrak al-Hakim, 4: 557-558; "he said: this is a hadith whose isnaad is sahih, although it was not reported by al-Bukhari and Muslim. Al-Dhahabi agreed with him, and al-Albaani said: this is a saheeh sanad, and its men are thiqaat (trustworthy), Silsilat al-ahaadeeth al-saheehah," 2: 336, hadeeth 771).
The christian colleague was rendered silent after this revelation.
[19:76] Allah increases in guidance those who follow the guidance. [20:47] Peace be upon those who follow the guidance.