hubieran contaminado
-they/you had polluted
Past perfect subjunctiveellos/ellas/ustedesconjugation ofcontaminar.

contaminar

Si hubieran pisado sobre las tumbas en ese lugar, se hubieran contaminado, y tendrían que esperar siete días más para poder ministrar.
If they had walked on the graves in that place, they would have become unclean and would have had to wait for seven days before they could enter and serve.
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