C. F. Keil and Franz Delitzsch on Psalms 26:12

Psa 26:12

The epilogue. The prayer is changed into rejoicing which is certain of the answer that shall be given. Hitherto shut in, as it were, in deep trackless gorges, he even now feels himself to be standing בּמישׁור,The first labial of the combination בם, בף, when the preceding word ends with a vowel and the two words are closely connected, receives the Dagesh contrary to the general rule; on this orthophonic Dag. lene, vid., Luth. Zeitschr., 1863, S. 414. upon a pleasant plain commanding a wide range of vision (cf. בּמּרחב, Psa 31:9), and now blends his grateful praise of God with the song of the worshipping congregation, קהל (lxx ἐν ἐκκλησίαις), and its full-voiced choirs.