"you say" (Mk 15:2)

σὺ λέγεις.

"Keep awake"

Mk 13:33 NRSV:  "keep alert [(ἀγρυπνεῖτε, form of ἀγρυπνέω)]"
Mk 13:34 NRSV:  "be on the watch [(γρηγορῇ, form of γρηγορέω)]"
Mk 13:35 NRSV:  "keep awake [(γρηγορεῖτε, form of γρηγορέω)]"
Mk 13:37 NRSV:  "Keep awake [(γρηγορεῖτε, form of γρηγορέω)]"
Mk 14:34 NRSV:  "keep awake [(γρηγορεῖτε, form of γρηγορέω)]"
Mk 14:37 NRSV:  "keep awake [(γρηγορῆσαι, form of γρηγορέω)]"
Mk 14:38 NRSV:  "Keep awake [(γρηγορεῖτε, form of γρηγορέω)]"

Psalms of Solomon 17

Psalms of Solomon 17:23 (21) ff.,

• vv. 23 (21) ff. in The Apocrypha and Pseudepigrapha of the Old Testament in English, ed. R. H. Charles (Oxford:  The Clarendon Press, 1913), vol. 2, pp. 649 ff., trans. G. Buchanan Gray, and
• vv. 21 ff. (v. 21 being the versification in the Septuagint as edited by Ralphs) in The Old Testament Pseudepigrapha, ed. James H. Charlesworth (Garden City, NY:  Doubleday & Company, Inc., 1985), vol. 2, pp. 667 ff., trans. R. B. Wright.

"Peter. . . . 'rebukes' Jesus, as though he were trying to exorcise a demon"

Mk 8:32:  "Peter . . . began to rebuke [(form of ἐπιτιμάω)] him.  But . . . [Jesus] rebuked [(form of ἐπιτιμάω)] Peter, and said, 'Get behind me, Satan!"

Mk 1:25:  "But Jesus rebuked [(form of ἐπιτιμάω) the unclean spirit]. . . ."
Mk 9:25:  "he rebuked [(form of ἐπιτιμάω)] the unclean spirit. . . ."