Catch Phrase/Oral Tradition


 * Older Than Feudalism with The Bible, Partly due to the earlier parts originally being oral tradition and therefore repetitive to aid memorization.
 * God has 'I am the God of Abraham, of Isaac, and of Jacob', sometimes appended with 'who brought you out of Egypt'.
 * Jesus has 'I tell you the truth' (or variants thereupon depending on the translation, such as 'Verily I say unto thee' or 'I tell you solemnly').
 * Biblical angels almost always introduce themselves with a "Fear not". It's anyone's guess as to why.