Verse
चातुर्वर्ण्यं मया सृष्टं गुणकर्मविभागशः ।तस्य कर्तारमपि मां विद्ध्यकर्तारमव्ययम् ॥
The fourfold order was created by Me according to the divisions of quality and active function. Know Me for the doer of this (the fourfold law of human workings) who am yet the imperishable non-doer.
Gītā 4·13