Nihongi: Chronicles of Japan from the Earliest Times to A.D. 697…
“ If while we are bound by this oath, the children produced are females, my heart is to be accounted black, but if they are males, it is to be thought red.' So they dug three true-wells of Heaven and stood opposite to one another. Then Ama-terasu no Oho-kami spoke to Sosa no wo no Mikoto and said:—'I am now about to give thee the sword which is in my girdle; do thou give me the curved jewels of Yasaka gem which thou hast.' Having thus covenanted they made a mutual exchange. ”
