From Bhikkhu Bodhi’s translation of the Aṅguttara Nikāya 4.170, Yuganaddha Sutta
Friends, whatever bhikkhu or bhikkhuni has declared the attainment of arahantship in my presence has done so by these four paths… [Yo hi koci, āvuso, bhikkhu vā bhikkhunī vā mama santike arahattappattiṁ byākaroti, sabbo so catūhi maggehi, etesaṁ vā aññatarena.]
Here, a bhikkhu develops insight preceded by serenity… [Idha, āvuso, bhikkhu samathapubbaṅgamaṁ vipassanaṁ bhāveti.]
Again, a bhikkhu develops serenity preceded by insight… [Puna caparaṁ, āvuso, bhikkhu vipassanāpubbaṅgamaṁ samathaṁ bhāveti.]
Again, a bhikkhu develops serenity and insight in conjunction… [Puna caparaṁ, āvuso, bhikkhu samathavipassanaṁ yuganaddhaṁ bhāveti.]
Again, a bhikkhu’s mind is seized by restlessness about the Dhamma. But there comes an occasion when his mind becomes internally steady, composed, unified, and concentrated. Then the path is developed in him. [Puna caparaṁ, āvuso, bhikkhuno dhammuddhaccaviggahitaṁ mānasaṁ hoti. Hoti so, āvuso, samayo yaṁ taṁ cittaṁ ajjhattameva santiṭṭhati sannisīdati ekodi hoti samādhiyati. Tassa maggo sañjāyati.]
[Update 8 Dec 12 9:15am: changed the title of the post. Meant buckets to me, but perhaps a bit too puzzling for others]
Ven. Sujato does a great job of addressing this in A Swift Pair of Messengers. He analyzes this sutta in particular in Chapter 2. Here’s a link to the work: http://santipada.org/aswiftpairofmessengers/wp-content/uploads/2012/08/A_Swift_Pair_of_Messengers_Bhikkhu_Sujato.html#tthFrefAFH