Seed not always singular?
2Sam 7:12 (NASU) When your days are complete and you lie down with your fathers, I will raise up your descendant after you, who will come forth from you, and I will establish his kingdom. 13 He shall build a house for My name, and I will establish the throne of his kingdom forever. 14 I will be a father to him and he will be a son to Me; when he commits iniquity, I will correct him with the rod of men and the strokes of the sons of men,