Somewhere on this wise (pou houtōs). See Heb 2:6 for pou tis for a like indefinite allusion to an Old Testament quotation. Here it is Gen 2:2 (cf. Exo 20:11; Exo 31:17). Moffatt notes that Philo quotes Gen 2:2 with the same “literary mannerism.”
Rested (katepausen). First aorist active indicative of katapauō, intransitive here, but transitive in Heb 4:8. It is not, of course, absolute rest from all creative activity as Jesus shows in Joh 5:17. But the seventh day of God’s rest was still going on (clearly not a twenty-four hour day).