Ghatvāvagga

Suttapiṭaka · Saṁyuttanikāya · Sagāthāvaggasaṁyutta · Vol. 15 · Section 198

[198] Standing to one side, that deity (devatā) addressed the Blessed One in verse: "Having slain what does one sleep at ease? Having slain what does one not sorrow? What is the one thing, O Gotama, whose killing you approve?"

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 1 other place

Vol. 15 · Section 225 — Māghasutta