Tzitzit & Tekhelet

(Num 15:38) "Speak to the sons of Israel, and tell them that they shall make for themselves tassels on the corners of their garments throughout their generations, and that they shall put on the tassel6734 of each corner a cord of blue8504.

H6734
ציצת
tsîytsith
tsee-tseeth'
Feminine of H6731; a floral or wing like projection, that is, a fore lock of hair, a tassel: - fringe, lock.

H8504
תּכלת
tekêleth
tek-ay'-leth
Probably for H7827; the cerulean mussel, that is, the color (violet) obtained therefrom or stuff dyed therewith: - blue.