Adam Clarke on Isaiah 15:5

My heart shall cry out for Moab "The heart of Moab crieth within her" - For לבי libbi, my heart, the Septuagint reads לבו libbo, his heart, or לב leb; the Chaldee, לבו libbo. For בריחיה bericheyha, the Syriac reads ברוחה berocheh; and so likewise the Septuagint, rendering it εν αυτῃ, Edit. Vat: or εν ἑαυτῃ, Edit. Alex. and MSS. I., D. II.

A heifer of three years old "A young heifer" - Hebrew, a heifer three years old, in full strength; as Horace uses equa trima, for a young mare just coming to her prime. Bochart observes, from Aristotle, Hist. Animal. lib. 4 that in this kind of animals alone the voice of the female is deeper than that of the male; therefore the lowing of the heifer, rather than of the bullock, is chosen by the prophet, as the more proper image to express the mourning of Moab. But I must add that the expression here is very short and obscure; and the opinions of interpreters are various in regard to the meaning. Compare Jer 48:34.

Shall they go it up "They shall ascend" - For יעלה yaaleh, the Septuagint and a MS. read in the plural, יעלו yaalu. And from this passage the parallel place in Jer 48:5 must be corrected; where, for יעלה בכי yaaleh bechi, which gives no good sense, read יעלה בו yaaleh bo.