The earliest record with the blessing of oils appears inside the Apostolic Tradition, an early Christian document usually acknowledged for being dated in advance of 235 CE. Currently, consecrating the oils is carefully tied to preparation for Holy Saturday’s Easter Vigil, as 1000's are baptized in the 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/