Charles H. Spurgeon on Psalms 142:4

Looked on my right hand. The allusion here, it is supposed, is to the observance of the ancient Jewish courts of judicature, in which the advocate, as well as the accuser, stood on the right hand of the accused (Ps 110:5). The Psalmist felt himself in the condition of one who had nobody to plead his cause, and to protect him in the dangerous circumstances in which he was placed. —James Anderson's Note to Calvin in loc.