The Epistles and Revelation
In the Pauline Epistles, there are several clear uses of sending vocabulary, “each conveying a different theological perspective within the larger salvific sphere.”  In Romans, Paul speaks of God “sending his own son in the likeness of sinful man to be a sin offering” (8:3). In Romans, Paul also asks how the people can hear unless the one who preaches is sent (10:15). When dealing with division in the church at Corinth over loyalty to certain leaders, Paul states, “For Christ did not send me to baptize, but to preach the gospel” (1 Cor. 1:17). Speaking to the heart of the Gospel, Paul makes reference to both God sending the Son and the Spirit in Galatians 4:4-6:
But when the time had fully come, God sent his Son, born of a woman, born under the law, to redeem those under law, that we might receive the full rights of sons. Because you are sons, God sent the Spirit of his Son into our hearts, the Spirit who calls out, “Abba, Father.”
In Second Thessalonians, Paul refers to God sending a “powerful delusion” to those who have rejected the gospel (2:11). Finally, in multiple places throughout the Pauline epistles we find Paul adopting and defending the title of apostle  or “sent one” (Rom. 1:1; 1 Cor. 1:1; 2 Cor. 1:1; Gal. 1:1; Eph. 1:1; Col. 1:1; 1 Tim. 1:1; 2 Tim. 1:1; Titus 1:1).
In the General Epistles, the author of Hebrews refers to Jesus as the “apostle”  or “sent one” (3:1). First Peter speaks of the “Holy Spirit sent from heaven” (1:12) and in keeping with Johannine tradition, 1 John speaks of the Son being sent by the Father (4:9-10, 14).
The Book of Revelation “uses the language of sending to convey a variety of theological ideas.”  In chapter one, the revelation is made known to John through the sending of an angel (1:1), later in the same chapter John is told to send messages to the seven churches (1:11), and in chapter five the seven spirits of God are “sent out into all the earth” (5:6). Finally, in chapter twenty-two we read that both God and Jesus send angels, one to prepare the people for what was to come, “The Lord, the God of the spirits of the prophets, sent his angles to show his servants the things that must soon take place” (22:6) and one to give John the message for the churches, “I Jesus, have sent my angel to give you this testimony for the churches. I am the Root and the Offspring of David, and the bright Morning Star” (22:16).
2. Apostle (apostolos) is defined by it s use in the New Testament and its relationship to the three words apostello, pempo, and the Twelve. Apostello (‘to send’) is used frequently in the Gospels, Acts, and the Epistles when referring to an authoritative commission. The word apostle is indebted to the Hebrew term shaliach. A shaliach, as used by the Jews, was someone sent by one party to another to handle negotiations concerning matters secular or matters religious. Harold E. Dollar, “Apostle, Apostles” in Evangelical Dictionary of World Missions, ed. A. Scott Moreau, Harold Netland and Charles Van Engen (Grand Rapids: Baker, 2000), 73-74.
3. In this case, Jesus is designated as “apostle,” a title that otherwise is never used of him in the New Testament. The title apostolos is invariably used for one sent on a commission by another, and is given specifically to the representative of Jesus sent out by him (see Matt 10:2; Mark 3:14; Luke 6:13; Acts 1:2; 14:14; Rom. 1:1; 1Cor. 4:9; 12:28). Luke Timothy Johnson, Hebrews: A Commentary (Louisville: Westminster John Knox Press, 2006), 106.