Exodus 39:21

וַיִּרְכְּס֣וּ אֶת־הַחֹ֡שֶׁן מִטַּבְּעֹתָיו֩ אֶל־טַבְּעֹ֨ת הָאֵפֹ֜ד בִּפְתִ֣יל תְּכֵ֗לֶת לִֽהְיֹת֙ עַל־חֵ֣שֶׁב הָאֵפֹ֔ד וְלֹֽא־יִזַּ֣ח הַחֹ֔שֶׁן מֵעַ֖ל הָאֵפֹ֑ד כַּאֲשֶׁ֛ר צִוָּ֥ה יְהוָ֖ה אֶת־מֹשֶֽׁה׃

καὶ πάντα τὰ σκεύη τῆς σκηνῆς καὶ πάντα τὰ ἐργαλεῖα αὐτῆς, (34) καὶ τὰς διφθέρας δέρματα ἠρυθροδανωμένα καὶ τὰ καλύμματα δέρματα ὑακίνθινα καὶ λοιπῶν τὰ ἐπικαλύμματα, (40) καὶ τοὺς πασσάλους καὶ πάντα τὰ ἐργαλεῖα τὰ εἰς τὰ ἔργα τῆς σκηνῆς τοῦ μαρτυρίου·

Greek text from Swete's edition, CC BY-SA 4.0

Y ataron el racional de sus anillos á los anillos del ephod con un cordón de jacinto, para que estuviese sobre el cinto del mismo ephod, y no se apartase el racional del ephod; como Jehová lo había mandado á Moisés.

Then they tied the rings of the breastpiece to the rings of the ephod with a cord of blue yarn, so that the breastpiece was above the waistband of the ephod and would not swing out from the ephod, just as the LORD had commanded Moses. Additional Priestly Garments (Exodus 28:31–43)