[1] = Synagoge epsilon728 (Photius, Lexicon epsilon1696), supplemented with syntactical information found also in Syntacticum Gudianum and Syntacticum Laurentianum. Hesychius epsilon5179 had given the same glossing synonym, after four others. The headword -- third person singular, present indicative active, of e)piskh/ptw (cf. epsilon 2579, and more generally epsilon 2578) -- must be quoted from somewhere. Extant possibilities begin with Aeschines 1.146.
[2] An abridgement of Procopius, Secret History 6.22, probably via the Excerpta of Constantine Porphyrogenitus.
[3] = Syntacticum Gudianum 590. This part of the entry is present only in mss GIM, and is probably intended for an expanded version of the entry that would also take into account a second meaning for the word, 'commands' or 'enjoins'. LSJ s.v. (web address 1).