Charles Ellicott Commentary Jeremiah 9:1

"Oh that my head were waters, and mine eyes a fountain of tears, that I might weep day and night for the slain of the daughter of my people!" — Jeremiah 9:1 (ASV)

Oh, that my head were waters ...! —Literally, Who will give my head waters ... ? The form of a question was, in Hebrew idiom as in Latin, the natural utterance of desire. In the Hebrew text, this verse comes as the last in Jeremiah 8:0. It is, of course, very closely connected with what precedes; but, on the other hand, it is even more closely connected with what follows. Strictly speaking, there ought to be no break at all, and the discourse should flow on continuously.

A fountain. —Here, as in Jeremiah 2:13; Jeremiah 17:13, and elsewhere, the Hebrew word makor is a tank or réservoir rather than a spring.