pli-tv-bi-pm:196.1–196.2

Yā pana bhikkhunī nimantitā sabhattā samānā santiṁ bhikkhuniṁ anāpucchā purebhattaṁ vā pacchābhattaṁ vā kulesu cārittaṁ āpajjeyya aññatra samayā, pācittiyaṁ. Tatthāyaṁ samayo, cīvaradānasamayo, cīvarakārasamayo, ayaṁ tattha samayo.

If a nun who has been invited to a meal visits families beforehand or afterwards without informing an available nun, except on an appropriate occasion, she commits an offense entailing confession. These are the appropriate occasions: it is the robe-giving season; it is a time of making robes.