Lác-fæsten

According to the Old English Dictionary:

a

lác-fæsten

fast considered as an offering :-- Ne gelýfe þæs nǽnig mon ꝥ him ne genihtsumige ꝥ fasten tó écere hǽlo, búton hé mid óþrum gódum hit geéce, and sé þe wille Drihtne bringan gecwéme lácfæsten, þonne sceal hé ꝥ mid ælmessan and mid mildheortum weorcum fullian, Bl. H. 37, 18. lac-fæsten