Trade ye herewith till I come (pragmateusasthe en hōi erchomai). First aorist middle imperative of pragmateuomai, an old verb from prāgma, business. Here only in the N.T. Westcott and Hort in their text read pragmateusasthai, first aorist middle infinitive (-ai and -e were pronounced alike). The infinitive makes it indirect discourse, the imperative direct.
While I am coming is what en hōi erchomai really means.