Is the saying that links Jacob’s (peace be upon him) statement, ﴿ And I fear that a wolf may devour him ﴾ [Qur’an 12:13], with his loss of Joseph and his eyesight, and his statement, ﴿ And I entrust my affair to Allah ﴾ [Qur’an 40:44], with the return of Joseph and his eyesight, correct and does it necessitate not saying, “I fear that such and such may happen”?

The phrase "Calamity is entrusted to logic/utterance" is neither a Quranic verse nor an authentic prophetic tradition (Hadith). Rather, it is an saying transmitted from some Companions and Successors, and a common proverb. Its meaning is that speech might align with divine decree, causing what a person has uttered to come to pass. This can happen, but it is not inevitable. Some exegetes have mentioned that what befell Jacob, peace be upon him, with the loss of Joseph after his statement: "And I fear that a wolf may devour him," falls under this proverb. However, the early imams of exegesis did not mention this, and it is not fitting to use what happened to prophets as a proverb to be cited in this manner. In conclusion, the occurrence of calamity due to speech is not inevitable, but it can be a cause. Therefore, Islamic law has forbidden invoking curses upon oneself, family, and children, and has enjoined guarding the tongue and speaking good words.