How did the mob know which man in the garden was Jesus?

Judas was the disciple who betrayed Jesus, and Judas had told the soldiers, “Whomever I kiss, He is the One; seize Him” (Matthew 26:48). The kiss in that culture was a sign of respect and homage as well as affection. Slaves kissed the feet of their masters as the utmost sign of respect. Disciples sometimes kissed the hem of their teacher’s garment as a token of reverence and deep devotion. It was common to kiss someone on the hand as a gesture of respect and honor. But a kiss on the face, especially with an embrace, signified personal friendship and affection. As if it weren’t enough for Judas to betray Jesus, in doing so he pretended the utmost affection, making his act even more despicable.