The Difference Between the Dhammah and the Fathah in "Tahur" and Mention of Its Similar Cases

The Shaykh : And regarding his saying "tahur," it is said "tahur" with a fathah on the ta' and "tuhur" with a dhammah on the ta'. The difference between them is that "tahur" (with fathah) is the name for that with which one purifies oneself, while "tuhur" (with dhammah) is the name for the act. Similarly, "sahur" (with fathah) means that with which one eats the pre-dawn meal, and "suhur" (with dhammah) means the act. You say, "I prepared suhur for so-and-so, so he ate the pre-dawn meal," correct? I prepared "sahur" for so-and-so, so he ate the pre-dawn meal, or should I say "suhur"? I heard one person reciting, "I prepared suhur for so-and-so," and then he started saying, "I prepared sahur for so-and-so." Which one is correct? The second one. But if I say, "I like so-and-so's suhur, where he delays it until near the dawn," is this with a fathah or a dhammah?
The student: With a dhammah.

The Shaykh : With a dhammah, because the intended meaning is the act. Okay, so is "tahur" in the hadith with a fathah or a dhammah? With a fathah. That is, "He made the earth a mosque for me, to be prayed in, and a tahur (purification) with which to purify oneself." He mentioned the rest of the hadith, but let us limit ourselves to this.