A very small particle; literally, a small horn; the minute tip at the extremity of some Hebrew letters, Matthew 5:18 . In transcribing the Hebrew Scriptures, the Jews exacted the utmost accuracy. Every page and every line must contain just so much; and he most trivial defect vitiated the whole roll, and compelled the scribe to begin his task anew. Yet the extreme care thus expressed for the perfect integrity of the letter of God's word is but a feeble illustration of the Savior's care for the same word-every truth, every threatening, and every promise has the most perfect guarantee possible: "It is easier for heaven and earth to pass, than one tittle of the law to fail," Luke 16:17 .