New Defender's Study Bible Notes
4:3 sardine stone. A red gemstone, from Sardius.
4:3 rainbow. The beautiful rainbow is mentioned only four times in Scripture (Genesis 9:13-16; Ezekiel 1:28; Revelation 4:3; 10:1). Each time it is associated with God in a time of judgment on the earth, but also associated with His mercy and grace during such times of judgment.