What is the ruling on one whose ablution is frequently nullified by the emission of wind, and should he leave the Tarawih prayer if his ablution is nullified after the fourth rak'ah while he is in the first row?

The emission of gas during prayer invalidates it, and one must exit to perform purification, then return to prayer. Purification is a condition for the validity of prayer and takes precedence over the virtue of the first row and the opening takbir. However, if the emission of gas is continuous, it does not invalidate the prayer then, because it is considered a perpetual discharge.