I don't remember the exact place, but I remember reading it, and I've only read silmarillion, Hobbit and LOTR, so it must have been in Silmarillion. I googled

I don't remember the exact place, but I remember reading it, and I've only read silmarillion, Hobbit and LOTR, so it must have been in Silmarillion. I googled for a while, the best thing I found is this: http://valarguild.org/varda/Tolkien/encyc/papers/Amaranth/DeathinTolkien.htm http://valarguild.org/varda/Tolkien/encyc/papers/Amaranth/De... > Thus, Eru found a means to amend the situation. After a time of waiting in Mandos's halls, the Elvish fëa may, if it chooses, be reincarnated in a hröa identical to the one in which the fëa was formerly housed. The Valar were given permission and power by Eru to see to the construction of a new hröa for the 'houseless' fëa, and they can judge that a fëa may not be reimbodied, or at least not yet, in certain situations. Normally, the reincarnated Elf remains in Aman. Only in special cases is the Elf sent back to Middle-earth, generally because he has some task yet to complete there