Song of Solomon 5:4 - Albert Barnes' Notes on the Bible

Put in his hand - Through (literally “from”) the hole (of the lock), in order to raise the pins by which the bolt was fastened. The Oriental lock is a hollow piece of wood attached to the doorpost, into which a sliding-bolt is made to run. As soon as the bolt has been driven home a number of pins drop into holes prepared in it for their reception. To raise these pins, and so enable the bolt to be withdrawn, is to unfasten the lock. This is commonly done by means of the key (literally “opener”), but may often be accomplished by the fingers if dipped in paste or some other adhesive substance. For such a purpose the beloved inserts his fingers here anointed with the costly unguent, which will presently distil on those of the bride when she rises to open to him.