Explanation of the words of Ibn Malik (may Allah have mercy on him): "Break it in the beginning and in the beginning of a relative clause *** and where 'in' completes an oath."

The Shaykh : "Break it in the beginning." This is a specification after a generalization. "Break it in the beginning" means if it occurs at the start of speech, that is, at the head of its clause, at the head of its clause, break it, break it. So you would say, for example: "Inni qayyim" (Indeed I am standing), "Inni qayyim," and it is not permissible to say "Anni qayyim."
If someone were to ask, "What do you say about the words of Allah the Exalted: Here, the clause "that they" has no connection to what came before it, so why was it opened (with fathah) even though it is at the beginning of its clause? The answer is that this is on the assumption of the lam (definite article), meaning "li-annahum" (because they) are returning to their Lord. And for this reason, we say that this clause is explanatory, meaning the cause of their hearts trembling is that they believe they are returning to Allah and do not know what they will bring to Allah. Therefore, you find them giving what they are given and doing righteous deeds, and their hearts are fearful, meaning fearful that their deeds will be rejected.
He said, "Break it in the beginning." Whenever "in" occurs at the beginning of the clause, what happens? It is broken.
You say "Inna Zaydan qayyim" (Indeed Zayd is standing), "Inna Zaydan qayyim," and it is not correct to say "Anna Zaydan qayyim," because it occurred at the beginning.
The second: "And in the beginning of a relative clause," meaning if it occurs at the beginning of the clause that serves as a relative clause for the relative pronoun, then it is broken. The reason for this is that it is, in reality, at the beginning of the clause, because the clause after the relative pronoun is dependent on it yet independent; dependent in the sense that it connects to it and clarifies its meaning, but it is independent, so for this reason it is broken. You say, "I like the one who is indeed understanding," "I like the one who is indeed understanding." And Allah, Blessed and Exalted is He, said: What is it? Yes.
The third: "And where 'in' completes an oath" means if it occurs as the answer to an oath, because what completes the oath is the answer. So if "in" occurs as the answer to an oath, it is obligatory to break it. Allah, Blessed and Exalted is He, said: What is it? Or does this one also have the lam? It has the lam. You say, "Wallahi inna Zaydan qayyim" (By Allah, indeed Zayd is standing), "Wallahi inna Zaydan qayyim," and if you said "Wallahi anna Zaydan qayyim," the speech would not be correct.
You say: "I swore by Allah that Zayd is standing." Is it correct? Why?
The student: ...

The Shaykh : No, it is correct because it is the answer to the oath, it is what is sworn upon. The third, the fourth.