Or, Then I passed by thee ... and I said.
Polluted - wallowing, “treading upon oneself.”
In thy blood - may be connected either with “I said” or with “Live.” In the latter case, the state of blood and defilement is made the very cause of life, because it called forth the pity of Him who gave life. Since in the Mosaic Law “blood” was especially defiling, so was it also the special instrument of purification.