[dosakkhayo]

I think it would be Bv 1.

“Cattāro te asaṅkheyyā,

koṭi yesaṁ na nāyati;

(1) Sattakāyo ca (2) ākāso,

(3) cakkavāḷā canantakā;

(4) Buddhañāṇaṁ appameyyaṁ,

na sakkā ete vijānituṁ.

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Jittananto, Tobias G, Sammasambodhi Gami