The Talmud teaches that when a person enters a dangerous situation they should pray, and the formula "I trust in You, my God" is discussed. The sugya illustrates how practical bitachon is expressed through prayer and conscious reliance on God during moments of danger.
תָּנוּ רַבָּנַן: מַעֲשֶׂה בְּהִלֵּל הַזָּקֵן שֶׁהָיָה בָּא בַּדֶּרֶךְ וְשָׁמַע קוֹל צְוָחָה בָּעִיר, אָמַר: מוּבְטָח אֲנִי שֶׁאֵין זֶה בְּתוֹךְ בֵּיתִי. וְעָלָיו הַכָּתוּב אוֹמֵר: ״מִשְּׁמוּעָה רָעָה לֹא יִירָא נָכוֹן לִבּוֹ בָּטֻחַ בַּה׳״. אָמַר רָבָא: כׇּל הֵיכִי דְּדָרְשַׁתְּ לְהַאי קְרָא מֵרֵישֵׁיהּ לְסֵיפֵיהּ — מִדְּרִישׁ, מִסֵּיפֵיהּ לְרֵישֵׁיהּ — מִדְּרִישׁ: מֵרֵישֵׁיהּ לְסֵיפֵיהּ מִדְּרִישׁ — ״מִשְּׁמוּעָה רָעָה לֹא יִירָא״, מַה טַּעַם? — ״נָכוֹן לִבּוֹ בָּטֻחַ בַּה׳״. מִסֵּיפֵיהּ לְרֵישֵׁיהּ מִדְּרִישׁ — ״נָכוֹן לִבּוֹ בָּטֻחַ בַּה׳, מִשְּׁמוּעָה רָעָה לֹא יִירָא״. הַהוּא תַּלְמִידָא דַּהֲוָה קָא אָזֵיל בָּתְרֵיהּ דְּרַבִּי יִשְׁמָעֵאל בְּרַבִּי יוֹסֵי בְּשׁוּקָא דְצִיּוֹן. חַזְיֵיהּ דְּקָא מְפַחֵיד. אֲמַר לֵיהּ: חַטָּאָה אַתְּ, דִּכְתִיב: ״פָּחֲדוּ בְצִיּוֹן חֲטָאִים״. אֲמַר לֵיהּ: וְהָכְתִיב ״אַשְׁרֵי אָדָם מְפַחֵד תָּמִיד״! אֲמַר לֵיהּ: הַהוּא בְּדִבְרֵי תוֹרָה כְּתִיב.
The Sages taught: There was an incident involving Hillel the Elder, who was coming on the road when he heard a scream in the city. He said: I am certain that the scream is not coming from my house. And of him, the verse says: “He shall not be afraid of evil tidings; his heart is steadfast, trusting in the Lord” (Psalms 112:7). Rava said: Any way that you interpret this verse, its meaning is clear. It can be interpreted from beginning to end or it can be interpreted from end to beginning. The Gemara explains: It can be interpreted from beginning to end: Why is it that: He shall not be afraid of evil tidings? Because his heart is steadfast, trusting in the Lord. The Gemara continues: And it can be interpreted from end to beginning: One whose heart is steadfast, trusting in the Lord is a person who shall not be afraid of evil tidings. The Gemara relates: This student was once walking after Rabbi Yishmael, son of Rabbi Yosei, in the marketplace of Zion. Rabbi Yishmael saw that the student was afraid. He said to him: You are a sinner, as it is written: “The transgressors in Zion are afraid, trembling has seized the ungodly” (Isaiah 33:14). The student replied: And is it not written: “Happy is the man that fears always” (Proverbs 28:14)? Rabbi Yishmael said to him: That verse is written with regard to matters of Torah, that one should be afraid lest he forget them. For everything else, one must trust in God.