1. Saññāmanasikāra Sutta. Ananda asks the Buddha how a monk can so develop concentration that he is quite unaware of all that is seen, heard, sensed, cognized, attained, sought after, or thought of. By the calming of all activities, the ending of craving, by Nibbāna, answers the Buddha. A.v.318f.
2. Saññāmanasikāra Sutta. Ananda asks the same question as in (1), and the Buddha gives the same answer. A.v.319f.
3. Saññāmanasikāra Sutta. Ananda asks the Buddha how a monk can so develop concentration that he pays no heed to what is seen, heard, etc., and yet does so. The answer is as in (1). A.v.321f.