Verse
एवं बहुविधा यज्ञा वितता ब्रह्मणो मुखे ।कर्मजान्विद्धि तान्सर्वान् एवं ज्ञात्वा विमोक्ष्यसे ॥
Therefore all these and many other forms of sacrifice have been extended in the mouth of the Brahman (the mouth of that Fire which receives all offerings). Know thou that all these are born of work and so knowing thou shalt be free.
Gītā 4·32