An island close to Pulo Breueh. ‘On the shore of that island a seven days’ feast is held every year. The first six days are dedicated to piasans (secular feasts), the main features of which are music and unlawful love-making, chiefly with married women. On the seventh day a buffalo is sacrificed, and it is supposed that this festival ensures the people for a whole year against the freaks of certain malignant jens who, if its celebration be neglected, avenge themselves by causing many to fall and break their necks.’ Also, the rice-field Blang Seureugong on the same island is believed to be the habitation of a jen, who must be propitiated by the giving of a yearly feast involving the slaughter of a buffalo.
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Source
The Achehnese, Vol. II, by Dr. C. Snouck Hurgronje, translated by A.W.S. O’Sullivan, indexed by R.J. Wilkinson. Leyden: E.J. Brill, 1906.