Ud 3.5
PTS: Ud 27
Kolita Sutta: Mahā Moggallāna
translated from the Pali by
Thanissaro Bhikkhu

I have heard that on one occasion the Blessed One was staying near Sāvatthī at Jeta's Grove, Anāthapiṇḍika's monastery. And on that occasion Ven. Mahā Moggallāna was sitting not far from the Blessed One, his legs crossed, his body held erect, having mindfulness immersed in the body well-established within. The Blessed One saw Ven. Mahā Moggallāna sitting not far away, his legs crossed, his body held erect, having mindfulness immersed in the body well-established within.

Then, on realizing the significance of that, the Blessed One on that occasion exclaimed:

With mindfulness immersed in the body well-established, restrained with regard to the six contact-media — continually centered, a monk can know unbinding for himself.
See also: MN 119 ; SN 47.20 .