Hazrat Ibn Abbas (may Allah be pleased with them) says that when you are performing prayer, do not wipe your hand over your forehead, do not blow, and do not move pebbles.

Hazrat Saeed bin Jubair says that doing so is a sign of irreligiousness.

Hazrat Ibn Buraidah says that it was said that four things are signs of irreligiousness: wiping the forehead with the hand before completing the prayer, urinating while standing, not responding to the call to prayer upon hearing the adhan, and blowing on the ground while in prostration.

Hazrat Mak'hool considered wiping the hand over the forehead during prayer to be disliked and said that it is a sign of irreligiousness.

Hasan considered it disliked to wipe the hand over the forehead before concluding the prayer with salam.

Hazrat Sha'bi considers it undesirable to wipe the hand over the forehead before completing the prayer, while Hazrat Hakam says there is no harm in it.

4789 - Al-Hakam said: There is no harm in it.

Hazrat Abdullah says that four things are signs of irreligiousness: performing prayer without a sutrah, wiping the forehead before completing the prayer, urinating while standing, and not responding upon hearing the call to prayer (adhan).