пещь

Old Church Slavonic

пещь

From Proto-Slavic *peťь, from Proto-Balto-Slavic *péktis, from Proto-Indo-European *pékʷtis, from *pekʷ-.

пещь • (peštĭ) f

oven, stove
- from Vita Methodii, 0900710-0900720:
  не троужаите моѥго Меѳодиꙗ, оуже бо сѧ ѥсть ꙗко и при пещи оупотилъ.
  ne tružaite mojego Meθodija, uže bo sę jestĭ jako i pri pešti upotilŭ.
  Do not trouble my Methodius, for he is already covered with sweat as though he were next to a stove.

Declension of пещь (i-stem)

Case	Singular	Dual	Plural
Nominative	пещь peštĭ	пещи pešti	пещи pešti
Accusative	пещь peštĭ	пещи pešti	пещи pešti
Genitive	пещи pešti	пещью, пещию peštĭju, peštiju	пещьи, пещии peštĭj, peštij
Locative	пещи pešti	пещью, пещию peštĭju, peštiju	пещьхъ peštĭxŭ
Dative	пещи pešti	пещьма peštĭma	пещьмъ peštĭmŭ
Instrumental	пещьѭ, пещиѭ peštĭjǫ, peštijǫ	пещьма peštĭma	пещьми peštĭmi
Vocative	пещи pešti	пещи pešti	пещи pešti

Nikolić, Svetozar (1989) Staroslovenski jezik: Pravopis, glasovi, oblici, Beograd

Borrowed from Old Church Slavonic пещь (peštĭ), from Proto-Slavic *peťь. Doublet of печь (pečʹ), the inherited East Slavic form.

пещь • (peščʹ) f inan (genitive пе́щи, nominative plural пе́щи, genitive plural пеще́й)

(dated, literary) oven, furnace (especially in religious contexts)
три о́трока впещи́ о́гненной ― tri ótroka v peščí ógnennoj ― the three children in the fire furnace (Shadrach, Meshach, and Abednego)

Declension of пещь (inan fem-form 3rd-decl accent-e)