Glass. The Hebrew word occurs only in Job 28:17, where in the Authorized Version it is rendered “crystal.” In spite of the absence of specific allusion to glass in the sacred writings, the Hebrews must have been aware of the invention. From paintings representing the process of glass-blowing which have been discovered at Beni-hassan, and in tombs at other places, we know that the invention was known at least 3500 years ago. Fragments too of wine-vases as old as the exodus have been discovered in Egypt. The art was also known to the ancient Assyrians. In the New Testament glass is alluded to as an emblem of brightness. Rev. 4:6; 15:2; 21:18.