[ULPIANUS libro secundo ad edictum. ] §12.6.17.prNam si cum moriar dare promisero et antea soluam, repetere me non posse Celsus ait: quae sententia uera est.
[ULPIAN, On the Edict, Book 2.] For if I should promise to give when I die and pay before that time, Celsus says that I cannot recover it; and this opinion is correct.