Majjhima Nikaya 2:187
SUJATOYo hi koci, bhikkhave, ime cattāro satipaṭṭhāne evaṁ bhāveyya sattāhaṁ, tassa dvinnaṁ phalānaṁ aññataraṁ phalaṁ pāṭikaṅkhaṁ
anyone who develops these four kinds of mindfulness meditation in this way for seven days can expect one of two results: