τί ἐμοὶ καὶ σοί is an idiomatic Semitic expression found both in the OT and in the NT, and ‘used to deprecate interference or, more strongly, to reject overtures of any kind. The shade of meaning can be deduced only from the context’ (JB). In the OT it sometimes indicates a harsh protest, as when Jephthah protests against the invasion of his land (Judg 11:12), or when the widow of Zarephath complains to Elijah (1 Kgs 17:18). Elsewhere, it may betoken simply a refusal to become involved (2 Sam