So I have heard.
At one time the Buddha was staying near Sāvatthī in Jeta’s Grove, Anāthapiṇḍika’s monastery.
Now at that time Venerable Cūḷapanthaka was sitting not far from the Buddha, cross-legged, his body set straight, and mindfulness established in his presence.
The Buddha saw him meditating there.
Then, understanding this matter, on that occasion the Buddha expressed this heartfelt sentiment:
“Steady in body, steady in mind,
standing, sitting or lying down:
a mendicant focusing on this mindfulness
gains an ever higher distinction.
And when they have done so,
they vanish from the King of Death.”