Saṃyutta Nikāya 47
Connected Discourses on the Establishments of Mindfulness
33. Neglected
“Bhikkhus, those who have neglected these four establishments of mindfulness have neglected the noble path leading to the complete destruction of suffering. Those who have undertaken these four establishments of mindfulness have undertaken the noble path leading to the complete destruction of suffering.
“What four?… as above … Those who have neglected … Those who have undertaken these four establishments of mindfulness have undertaken the noble path leading to the complete destruction of suffering.”