→ Written by David to Joab 2Sa 11:14
→ King of Syria to king of Israel 2Ki 5:5,6
→ Rabshakeh to Hezekiah Isa 37:9-14
→ King of Babylon to Hezekiah Isa 39:1
→ Sennacherib to Hezekiah 2Ki 19:14
→ Of Artaxerxes to Nehemiah Ne 2:7-9
→ Open letter from Sanballat to Nehemiah Ne 6:5
→ Luke to Theophilus (the books of Luke and Acts) Ac 1:1
→ Claudius Lysias to Felix Ac 23:25-30
→ Letters of intercession by Paul and Philemon on behalf of Onesimus Phm 1:1
→ Of recommendation 2Co 3:1