The earliest record in the blessing of oils seems while in the Apostolic Tradition, an early Christian doc generally acknowledged to become dated before 235 CE. Nowadays, consecrating the oils is closely tied to preparing for Holy Saturday’s Easter Vigil, as hundreds are baptized in to the Catholic Church https://liantong.com.tw/%e6%83%b3%e8%be%a6%e7%90%86%e6%96%b0%e7%ab%b9%e6%88%bf%e5%b1%8b%e4%ba%8c%e8%83%8e%e8%b2%b8%e6%ac%be%ef%bc%9f%e8%81%af%e9%80%9a%e8%b2%b8%e6%95%99%e6%82%a8%e5%a6%82%e4%bd%95%e7%b0%a1%e5%96%ae%e7%94%b3/