מלכים א ח:כב פירוש: רש״י

And Shlomo stood before the Altar of Adonoy. [As] it is written, “and Shlomo made a copper basin and had set it in the midst of the court, etc. and upon it he stood, and knelt on his knees.”¹⁵Even though a king of Yisroel is allowed to sit in the Beis Hamikdosh [See II Shmuel 7:18], Shlomo chose to stand.¹⁶II Divrei Hayomim 6:13.