Hazrat Abu Hurairah (May Allah be pleased with him) reported: The Messenger of Allah [SAWW](PBUH) said,
"Between the two Blowing of the Trumpet there will be an interval of forty.'' The people said, "O Abu Hurairah! Do you mean forty days?'' He said, "I cannot say anything.'' They said, "Do you mean forty years?'' He said, "I cannot say anything.'' They said, "Do you mean forty months?'' He said, "I cannot say anything. The Prophet added: `Everything of the human body will perish except the last coccyx bone (end part of the spinal cord), and from that bone Allah will reconstruct the whole body. Then Allah will send down water from the sky and people will grow like green vegetables'.''
[Al-Bukhari Book 06, Chapter 60, Hadith # 457]
Lesson : as mentioned above in Surah Al-Hajj Ayat 07."there is no doubt about it, and certainly, Allah will resurrect those who are in the graves"
1. When Israfil blows the Trumpet th...e first time, by Allah's Leave, all those who are in the heavens and on earth will swoon away, except him whom Allah will. This will be the first Blowing. Then, it will be blown a second time, they will become alive and will emerge from their graves. These Blowings are known as the `Blowings of Fainting and Rising'. As regard the interval between these two Blowings, the narrator of the narration, Abu Hurairah (May Allah be pleased with him), could not say anything when he was asked about it; as he himself did not know it. But in other narrations the interval has been mentioned as forty years.
2. The earth eats away the whole body of humans except the bodies of the Prophets. However, only the end part of the spinal cord remains intact. How it remains intact is known to Allah, but from it mankind will be created again. 3. Bodies will rise from the earth as vegetation springs out from the earth after the rainfall.