Nicene and Post-Nicene Fathers, Ser. II, Vol. XIV:
The Canons of the Council in Trullo; Often Called The Quinisext Council.: Canon LXV

Canon LXV.

The fires which are lighted on the new moons by some before their shops and houses, upon which (according to a certain ancient custom) they are wont foolishly and crazily to leap, we order henceforth to cease.  Therefore, whosoever shall do such a thing, if he be a cleric, let him be deposed; but if he be a layman, let him be cut off.  p. 395 For it is written in the Fourth Book of the Kings “And Manasses built an altar to the whole host of heaven, in the two courts of the Lord, and made his sons to pass through the fire, he used lots and augurs and divinations by birds and made ventriloquists [or pythons 380 ] and multiplied diviners, that he might do evil before the Lord and provoke him to anger.” 381

Notes.

Ancient Epitome of Canon LXV.

The fires which were made upon the new moons at the workshops are condemned and those who leaped upon them.

Lupin remarks that the fires kindled on certain Saints’ days are almost certainly remains of this heathen practice.  These fires are often accompanied with leaping, drinking, and the wrestling of young men.

Footnotes

Only in the Latin.

2 Kings 21:5, 6.