מוסר אויף שמות 5:22

וידבר אלהים אל משה. G–d spoke harshly with Moses because Moses had been adamant in saying to G–d: "Why have You caused things to get worse for this people and why have You sent me?" Moses was guilty of questioning the ways of G–d, and that was why G–d expressed regret at the passing of the patriarchs who had never been guilty of questioning His ways. Rashi explained all this at length. We therefore have to learn from this to be extremely careful not to question G–d, whether it is when He confers benefits or when He appears to afflict us. G–d is the true צדיק. Sometimes we think that what happens to us is bad; G–d however, knows that it is all for our good even if we fail to recognise this at the time.