Isaiah 57:5

New English Translation

⁵you who inflame your lusts^[a] among the oaks^[b] and under every green tree,
who slaughter children near the streams under the rocky overhangs.^[c]

Isaiah 57:5 tn Heb “inflame yourselves”; NRSV “burn with lust.” This verse alludes to the practice of ritual sex that accompanied pagan fertility rites.
Isaiah 57:5 tn The term אֵלִים (ʾelim) may be from a root meaning “mighty ones,” referring to mighty trees. The form may also refer to “gods,” a less common masculine plural of (ʾel). This would fit the context of idolatry (lusting after gods).
Isaiah 57:5 sn This apparently alludes to the practice of child sacrifice (cf. TEV, CEV, NLT).

New English Translation (NET)