'Promisedst' in the Bible

Who hast kept with thy servant David my father that thou promisedst him: thou spakest also with thy mouth, and hast fulfilled it with thine hand, as it is this day.

Therefore now, LORD God of Israel, keep with thy servant David my father that thou promisedst him, saying, There shall not fail thee a man in my sight to sit on the throne of Israel; so that thy children take heed to their way, that they walk before me as thou hast walked before me.