Pistol-bóc

According to the Old English Dictionary:

pistol-bóc

f. A book containing the Epistles :-- Hé (the priest) sceal habban ða wǽpna tó ðam gástlícum weorce ... ðæt synd ða hálgan béc, saltere and pistolbóc, godspellbóc and mæssebóc, L. Ælfc. C. 21 ; Th. ii. 350, 11-13. Hé (bishop Leofric) hæfþ ðiderynn (St. Peter's minster at Exeter) gedón ... ii. pistelbéc ... Hé ne funde on ðam mynstre ðá hé tó féng bóca ná má búton ... .i. pistelbóc ... , Chart. Th. 430, 8-29. [Cf. Icel. pistla-bók.] pistol-boc