godsend (n.) Look up godsend at Dictionary.com
1814, "a shipwreck" (from the perspective of people living along the coast), from Middle English Godes sonde (c.1200) "God's messenger; what God sends, gift from God, happening caused by God," from god + Middle English sonde "that which is sent, message," from Old English sand, from sendan (see send (v.)). Sense of "happy chance" is from 1831.