The word guardasteis is the preterite form of guardar in the second person plural.
See the full guardar conjugation

guardar

Que recibisteis la ley por disposición de ángeles, y no la guardasteis.
Who have received the law by the disposition of angels, and have not kept it.
Desde los días de vuestros padres os habéis apartado de mis leyes, y no las guardasteis.
From the days of your fathers you have been turned away from my rules and have not kept them.
Desde los días de vuestros padres os habéis apartado de mis leyes, y no las guardasteis.
Even from the days of your fathers ye are gone away from Mine ordinances, and have not kept them.
Dijiste que tú y Bell jamás guardastéis una lista de los niños con los que experimentastéis.
Now, you've said that you and bell Never kept a list of the children That you experimented on.
Dijiste que tú y Bell jamás guardastéis una lista de los niños con los que experimentastéis.
Now, you've said that you and bell Never kept a list of the children That you experimented on.
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