Gabriel of Qatar
Commentary on the liturgy
The Commentary on the Liturgy by Gabriel of Beth Qatraye (early seventh century) is preserved in a single thirteenth-century manuscript, British Library Or. 3336. The first few folios are missing. The work consists of 5 memre. A list of chapters is online, together with a portion of the otherwise unpublished Syriac text, in Brock's article.
Sebastian P. Brock, Gabriel of Qatar's Commentary on the Liturgy, Hugoye 6.2 (2003).