Wings.
Used as a symbol of protection. Under 'the shadow of God's wings' is referred to in the Psalms; and the Lord said He would often have gathered Israel as a hen gathereth her chickens under her wings, but they would not. Psalms 17:8; Psalms 36:7; Psalms 57:1; Matthew 23:37; etc. Wings were given for rapid motion. The living creatures in Ezekiel 1, had each four wings, and those in Isaiah 6:2 and Revelation 4, had each of them six wings. God's executives are swift messengers.