• Yuganaddha or Yuganandha Sutta

Ananda tells the monks at Ghositārāma, in Kosambī, that those who have attained arahantship have done so in one of four ways: Kosambī

• by developing insight preceded by calm,
• or calm preceded by insight,
• or calm and insight together,
• or by having a mind utterly devoid of perplexities about the Dhamma. A.ii.157.