In Testamentum Domini 1.28 (part of the mystagogy) the Syriac reads ܕܡܢܗ ܠܠܒܵܘܬܐ ܕܗܢܘܢ ܕܕܚܠܝܢ ܠܗ. This does not make a lot of sense, and so Rahmani emends ܕܡܢܗ to ܕܡܢܗܪ (thus “illuminates the hearts of those who fear him”). Cooper and Maclean, alternatively, suggest ܕܡܢܝܚ, thus “delights the hearts”, based on a reading of the Arabic Didascalia. Yesterday I checked the readings of O. Burmeister, “The Coptic and Arabic versions of the Mystagogia” Le Muséon 46 (1933), 203-235, to find that the Coptic version from the liturgy of Maundy Thursday is the same as the Arabic Didascalia, thus “delights”. But bafflingly the Arabic of the Borgian Arabic MS of the Testamentum has “illuminates”! Baffling, I should clarify, because this text is in the Egyptian tradition, and so the variation cannot be ascribed to circles of transmission. All very odd, as I cannot see how the confusion might come about in Greek, though clearly two versions were circulating.