But first, I should try to find if this phrase exists in any Assamese song. Let me search "Ojaga" in Assamese songs. results are in Bengali, not Assamese.
: Some variations of Ojaga Satra involve fasting or following a strict vegetarian diet. This dietary discipline aims to cleanse the body of toxins and to focus the mind on spiritual pursuits. Ojaga Satra Thu Nabagi Wari 40