Is it necessary to repeat ablution upon the emission of odorless and soundless gases, which often occurs when intending to pray or perform an act of obedience?

If you are certain that a gas has been emitted, you must repeat your ablution. However, if the emission of gas is so frequent that you cannot find time to pray with a valid state of purity, then you are considered to have chronic flatulence. In this case, you should perform ablution for each prayer after its time has begun, and then you may perform the obligatory and supererogatory prayers. Whatever is emitted from you thereafter will not harm your purity for that prayer.