TT #244 · Parashas Shoftim · Sixth Aliyah · Passuk 19:17
Then the two men who have the dispute shall stand before the Eternal, before the kohanim and the judges who will be in those days.
Torah Temimah points to Sifrei Devarim 190 / Sanhedrin.
TT lemma: וְעָמְדוּ שְׁנֵי הָאֲנָשִׁים.
Sefaria — Sifrei Devarim 190 / Sanhedrin
English: ‘Then the two men shall stand’ – that they shall be standing.
Derash on the posture of judgment (Sifrei / Bavli) — standing is the required posture.
The parties (and witnesses) stand before the judges; the judicial process is conducted in a standing posture.