Seventeen civilian activists from the Uri Tzafon movement were detained by the military and returned to Israel after crossing the border into Lebanon on Wednesday.
The activists claimed that they remained within Lebanese territory for hours before they were located by authorities and transferred to the Israel Police.
In a statement released on their Telegram, Uri Tzafon called for Jewish settlement in southern Lebanon.
The Uri Tzafon Movement has previously spoken out in support of Israeli citizens attempting to enter, and settle, in southern Syria.
Previously it has called attempts to settle Syria and Lebanon as "moral and historical steps," aimed at protecting communities in northern Israel.
Settler activists breached Syrian border
Wednesday's attempted border crossing followed a series of attempts by the "HaBashan Pioneers" to establish Jewish settlements in Syria.
Last week, the IDF detained three Israeli activists from the movement after they breached the Syria border.
An earlier report from Army Radio said that the activists were in Syrian territory for several hours before the IDF located and removed them.
The activists were returned to Israeli territory and handed over to police, the IDF said, noting that the military "strongly condemns" such incidents as they disrupt operations and create a dangerous situation for all involved.
The incident was the fourth recent attempt by the group to enter Syria.
Police are required to pursue justice for the "criminal offense" committed by these activists, the IDF said. Legal action was intended to dissuade further attempts to illegally cross Israel's northern borders.