estaban incursionando
-they/you were venturing
Imperfect progressive ellos/ellas/ustedes conjugation of incursionar.

incursionar

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Además, las semillas de lo que después se volvió el Gnosticismo desarrollado del segundo siglo estaban presentes en el primer siglo y ya estaban incursionando en las iglesias.
Also, the seeds of what later became the full-blown Gnosticism of the second century were present in the first century and already making inroads into the churches.
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