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Joüon §59g: "In the light of Ugr. tštḥwy “she prostrates herself,” what used to be considered hitpa̧ʿlẹl, represented almost entirely by the frequent הִשְׁתַּחֲוָה to worship, to prostrate oneself, is most likely a Hištafʿel of √ חוי."
Joüon §79t:
"Verb חיה: Hištafʿel form הִשְׁתַּחֲוָה to bow down, to prostrate oneself, to worship.
The original root is חוי, i.e. ל״י (cf. § a). The conjugation is hištafʿel (§ 59g; not Hitpaʿlel). The form expresses the causative reflexive action to bow down, to prostrate oneself().
In the perfect the primitive form is hištaḥway. The future *yištaḥway has become יִשְׁתַּחֲוֶה (3rd pl. יִשְׁתַּחֲווּ). The apocopated form is *yišta'ḥw, in which the consonantal w becomes the vowel u: וַיִּשְׁתַּ֫חוּ.
Observation. In 2Kg 5.18 הִשְׁתַּחֲוָיָתִי the inf. has been vocalised in Biblical Aramaic fashion (wrongly, actually, for with the suffixes the inf. takes the ending ūt(). After a scribe had wrongly spelled וי, this sequence was later vocalised mechanically in the Aramaic fashion. One should read (in the 3rd pers.) הִשְׁתַּחֲווֹתוֹ."
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