If one prays sitting, does he place his hands on his chest or on his thighs?

Question:
This questioner, Muhammad, says: May Allah preserve you. Is it the recommended practice (sunnah) for the one praying while sitting to place his hands on his knees or on his chest? Some hadiths indicate the prescription of placing them on the knees, so what is the correct ruling?

Answer:
When sitting in the place of standing, if one is unable to stand, he places his hands on his chest, just as in the state of standing. As for the sitting between the two prostrations and the first and last tashahhud, he places his hands on his thigh. Yes.