Midrash su Salmi 70:78

R. Chiya b. Joseph said: "In the future the righteous will break through [the ground] and rise in Jerusalem, as it is said "(Pr. 72, 16) And men shall break through the city like herbs of the earth; and the city refers to Jerusalem, as it is said (II Kings 19, 34) And I will shield this city." R. Chiya b. Joseph said further: "In the future the righteous will survive clothed in their clothes. This can be proved by applying a fortiori; if wheat which is buried in the ground naked comes forth covered with many covers, how much more so should it be with the righteous, who were buried covered with their clothes."