Acts 26:16

16But get up and stand on your feet, for I have appeared to you for this reason, to designate you in advance
L&N 30.89 has “‘to choose in advance, to select beforehand, to designate in advance.’”
as a servant and witness
As a servant and witness. The commission is similar to Acts 1:8 and Luke 1:2. Paul was now an “eyewitness” of the Lord.
to the things
BDAG 719 s.v. ὁράω A.1.b states, “W. attraction of the relative ὧν = τούτων ἅ Lk 9:36; Ac 22:15. The attraction may be due to colloq. breviloquence in μάρτυρα ὧν τε εἶδες με ὧν τε ὀφθήσομαί σοι a witness to the things in which you saw me and to those in which I shall appear to you Ac 26:16b.”
you have seen
‡ Some mss read “of the things in which you have seen me.” The accusative object με (me, “me”) is found after εἶδές (eides) in B C*vid 614 945 1175 1505 1739 1891 2464 pc sy sa; it is lacking in Ƥ74 א A C2 E Ψ 096 Maj. latt bo. The external evidence is relatively evenly divided, though there is a slight preference for the omission. NA27 includes the word in brackets, indicating some doubt as to its authenticity.
and to the things in which I will appear to you.
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