Hazrat Abdullah bin Amr (may Allah be pleased with him) relates that the Holy Prophet (peace and blessings of Allah be upon him) said:
يَنْزِلُ عِيسَى بنُ مَرْيَمَ إِلَى الْأَرْضِ فَيَتَزَوَّجُ وَيُولَدُ لَهُ وَيَمْكُثُ خَمْسًا وَأَرْبَعِينَ سَنَةً ثُمَّ يَمُوتُ فَيُدْفَنُ مَعِي فِي قَبْرِي فَأَقُوْمُ أَنَا وَعِيسَى بنُ مَرْيَمَ فِي قَبْرٍ وَاحِدٍ بَيْنَ أَبِي بَكْرٍ وَعُمَرَ .
“When Jesus, son of Mary, descends to the earth, he will marry and children will be born to him. [After being divinely commissioned,] he will remain for [about] forty-five years, then he will pass away and will be buried with me in my grave. Thus, I and Jesus, son of Mary, will rise from one grave situated between Abu Bakr and Umar [i.e., in terms of spirituality and the purpose of our advent, the four of us will be united in attributes and as one].”
[Mishkat al-Masabih, no. 5508; based on the Urdu translation of Hadiqatus Saliheen, no. 953, pp. 901–902, 2015 ed.]