From Wiktionary, the free dictionary
Old Church Slavonic
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From за (za) + -нь (-nĭ), the latter representing the accusative of и (i).
зань • (zanĭ) (Old East Church Slavonic)
- for him
1581, Ostrog Bible, 1 Samuel 2.25:и҆л̂и а҆ще гв҃и съгрѣшит̑, кт̂о помо́литсѧ за́нь- i҆l̂i a҆šte gv:i sŭgrěšit̑, kt̂o pomólitsę zánĭ
- but if a man sin against the LORD, who shall intreat for him?