The earliest document of the blessing of oils seems while in the Apostolic Tradition, an early Christian document usually acknowledged to generally be dated before 235 CE. Currently, consecrating the oils is closely tied to planning for Holy Saturday’s Easter Vigil, as thousands are baptized into your Catholic Church https://liantong.com.tw/%e6%96%b0%e7%ab%b9%e6%88%bf%e5%b1%8b%e4%ba%8c%e8%83%8e%e8%b2%b8%e6%ac%be%e8%a9%b3%e7%b4%b0%e6%94%bb%e7%95%a5%ef%bc%9a%e6%8f%90%e4%be%9b%e8%b3%87%e9%87%91%e5%bd%88%e6%80%a7%e7%ae%a1%e7%90%86/