Adam Clarke on Matthew 26:58

Peter followed him afar off - Poor Peter! this is the beginning of his dreadful fall. His fear kept him from joining the company, and publicly acknowledging his Lord; and his affection obliged him to follow at a distance that he might see the end.

And sat with the servants, to see the end - When a man is weak in faith, and can as yet only follow Christ at a distance, he should avoid all dangerous places, and the company of those who are most likely to prove a snare to him. Had not Peter got to the high priest's palace, and sat down with the servants, he would not thus have denied his Lord and Master. Servants-officers, υπηρετων. Such as we term serjeants, constables, etc.