How do the stages of insight before stream entry relate to the suttas Are the stages of knowledge before stream entry mentioned in the suttas? How does this correlate with the Visuddhimagga? E.g. sabba-kaya-patisamvedi (in some interpretations) may directly relate to bhanga-ñāṇa.
The sixteen stages of knowledge are taken for the most part from the Patisambhidamagga, a treatise attributed to Sariputta. They are also enumerated in the Abhidhammatthasangaha. Some are specifically mentioned in the suttas, e.g.:
udayabbaya

Yo ca vassasataṃ jīve apassaṃ udayabbayaṃ
Ekāhaṃ jīvitaṃ seyyo passato udayabbayaṃ.
Dhp. 113

nibbida

Sabbe saṅkhārā aniccā'ti yadā paññāya passati
Atha nibbindati dukkhe esa maggo visuddhiyā.
Dhp. 277

ādīnava

Disvā ādīnavaṃ loke ñatvā dhammaṃ nirūpadhiṃ,
Ariyo na ramatī pāpe pāpe na ramatī suci.
Ud. 5.6

The knowledges are also closely related to the seven visuddhis from the Rathavinita Sutta (MN 24), again attributed to Sariputta (and Punna Mantaniputta).