What is the authenticity of the statements regarding the prohibition of women whistling, that crossing one's legs is a sign of arrogance, and that moving one's legs or feet while sitting removes blessings from the house, and is there any evidence for these from the Sunnah?

The fundamental principle concerning acts of worship is prohibition, unless there is evidence of their permissibility. The fundamental principle concerning customs is permissibility, unless there is evidence of their prohibition.

Applying this to the mentioned matters:

1. Whistling: It is disliked for men, and even more disliked and prohibited for women, as it is unbecoming of them and involves imitation of men and the foolish. 2. Crossing one's legs (placing one leg over the other): This does not indicate arrogance and is permissible, as the Prophet (peace be upon him) and his Companions did it. However, one should observe people's customs to avoid misjudgment. 3. Moving one's legs or feet while sitting: It is permissible and does not remove blessings from the house. The claim that this action removes blessings has no evidence. 4. A woman's sitting posture: She must sit modestly and composedly, avoiding any posture that would be criticized, especially in the presence of men.