"If I live and have my health"

This was usually said as a joking proviso in connection with a non-vital promise to be carried out in the next day or two. Google cites Dickens's Dombey and Son most frequently (said by Walter, in a conversation with Captain Cuttle), with Dryden tossed in. Dryden means most to me because I read his translation of the Aeneid along with reading Virgil in Latin.