OfA בזי ; Qum, Palm. also bdy . Syriac almost always preposed ܒܕ; so too in the negative ܒܕܠܐ; With zy or dy always written independently; as bd it may be independent or joined to the following word.

Comparing the Syriac and earlier exxamples with the JBA examples adduced in DJBA, it appears that the JBA usage is an innovation and not the heir of the earlier usage.
In Samaritan also used to translate Hebrew בַּאֲשֶׁר (e.g. Gen. 21:17) where the original sense is "in the place where", but there is no reason to suppose that such a meaning ever attached to the Aramaic form.