Chasidut zu Bereschit 41:28

Genesis 47,19. “and provide us with seed so that we ‎may live and not die.” See Rashi’s commentary on ‎this verse who explains that since the arrival of Yaakov in Egypt ‎and his blessing, the people had begun to sow seed again ‎although the famine had been predicted to last for seven years. ‎Compare also the answer to the question of Nachmanides how ‎Yaakov was able to annul an interpretation given by his son of ‎Pharaoh’s dream according to which the famine would last for ‎seven years. After all, Joseph had spoken in the name of G’d when ‎he had told Pharaoh: ‎את האלוקים עושה הגיד לפרעה‎, “G’d has ‎revealed to Pharaoh that which He is about to do.” (Genesis 41,28) ‎Joseph had implied that no tzaddik could interfere with this ‎decree of G’d, although the Talmud in Moed Katan 16 told ‎us of the ability of the tzaddik through his prayer to bring ‎about a cancellation of harmful decrees. We must answer that ‎what Joseph had told Pharaoh at that time concerned the existing ‎circumstances, when there was no tzaddik in Egypt whose ‎prayer could influence G’d to rescind part or all of His decree. ‎With the arrival of Joseph’s father in Egypt, circumstances had ‎changed, as there now was a tzaddik of sufficient caliber to ‎bring about a cessation of this decree. This is why Joseph could ‎hand out seed and this was not a waste.‎