I was reading Babette Babich's paper on The Ister, the documentary, for next month's Heidegger Circle, and at the end there's Hölderlin's poem, with a translation "attuned to word order". I put on the Bruno Ganz "Hölderlin" album and followed the poem. I was surprised that Bruno skipped a line:

Sie sollen nemlich
Zur Sprache seyn.

Translated as:

They should namely
To language be.

I looked up the poem in my Sieburth (1984) translation of Hölderlin's hymns, and it doesn't have that line either. Then I looked in the 1942 lectures on the poem. Heidegger reads the poem at the beginning, with that line. William McNeill and Julia Davis translate it as:

Namely, they are
To be to language.

They [rivers] are beyng toward language. They give the needed sign.  ¶ 11:21 PM