Tayammum on grass that has no dust on it

The questioner:
Abu Majd is with us from al-Qassim. Go ahead, Abu Majd, you are with us. Peace be upon you, and Allah's mercy and blessings. And upon you be peace, and Allah's mercy.

The Shaykh:
Peace be upon you and Allah's mercy.

The questioner:
Salih, we went out to the desert once and sat in a wadi during the spring season, and the prayer became obligatory upon us, but we had no water with us. We performed tayammum, but the grass was deep, meaning in the middle of the wadi there was no soil to be found. I told the brothers that it must be on something with soil. So, does the soil have to be something we stumble upon, or is it okay to perform tayammum on the grass? Thank you.

The Shaykh:
No, if the grass has dust on it, there is no harm. If the grass has dust on it, there is no harm in performing tayammum on it. But if it does not have dust on it, you must go outside the wadi; it is not sufficient, my brother.

The questioner:
Okay, regarding the prayer we prayed: I actually dug up the grass to the right and left and performed tayammum, but some of them did not perform tayammum. What is the ruling on their prayer?

The Shaykh:
The one who limited himself to striking the grass, which had no dust on it, and did not go to the soil, has not purified himself for the prayer, so he must repeat it. Yes.

The questioner:
Okay, the second question, Shaykh.