Praise be to Allah, and may peace and blessings be upon the Messenger of Allah. To proceed:
The martyr has a great status with Allah, the Most High. He has informed us that the martyrs are alive with their Lord and provided for, and this is a life in Barzakh that differs from the life of this world. Its true nature is known only to Allah.
Allah, the Most High, says:
﴿And do not think of those who are killed in the cause of Allah as dead. Rather, they are alive with their Lord, receiving provision.﴾ [Al 'Imran: 169]
It is authentically established in Sahih Muslim that the souls of the martyrs are in the bodies of green birds, roaming freely in Paradise wherever they wish, then returning to lamps suspended beneath the Throne.
As for the bodies of the martyrs, the general principle is that the bodies of the children of Adam decay and are consumed by the earth, and nothing remains of them except the coccyx (the tailbone). The bodies of the prophets are authentically established as an exception. As for martyrs, there are authentic incidents in which some of their bodies were found preserved after a long period of time. However, there is no clear authentic evidence establishing that the bodies of all martyrs are not consumed by the earth until the Day of Resurrection. Therefore, this cannot be asserted for every martyr.
As for the Day of Resurrection, the martyr will be resurrected together with all the people, and his soul will be returned to his body, as Allah, the Most High, says:
﴿And indeed, the Hour is coming—there is no doubt about it—and Allah will resurrect those in the graves.﴾ [Al-Hajj: 7]
Thus, the martyr's life in Barzakh and the blessings he receives there do not mean that he will not be resurrected on the Day of Resurrection or that he will not experience the events of that Day. Rather, he will return to his body and be resurrected just as the rest of the people are resurrected.
However, the martyr has received special blessings in Barzakh, as his soul is in Paradise enjoying its blessings until Allah permits the Resurrection, after which it is returned to his body.
When the Hour is established, the martyr will be among the people in the gathering place of the Resurrection. The marks of the wounds he suffered in the cause of Allah may appear on him, as the Prophet ﷺ said:
“Every wound that a Muslim suffers in the cause of Allah will appear on the Day of Resurrection as it was when it was inflicted: blood will flow from it, its color will be the color of blood, and its scent will be the scent of musk.” Agreed upon.
Therefore, the martyr passes through Barzakh and enjoys its blessings, then he will be resurrected on the Day of Resurrection with the people and will be present at the scene of reckoning. His enjoyment of the blessings of Barzakh does not mean that he enters Paradise eternally before the reckoning. As for the honor and virtue granted to him, they are greater than the condition of ordinary believers.
And Allah knows best.