<p>18:12 <i>I fast twice in the week, I give tithes of all that I get</i>- Fasting was only required by the Law on the day of Atonement; and tithing was only of cattle and agricultural produce. Obedience to law, and even exceeding legal requirements, was not the basis for justification; for it is the hopeless sinner who goes away justified (:14); as noted on :11, Luke seems to be preparing the way for Paul's later expositions on justification of sinners by faith and not legal obedience.</p>