Berakhot 30A

לישתף אינש נפשיה בהדי צבורא. היכי נימא? ״יהי רצון מלפניך ה׳ אלהינו שתוליכנו לשלום״ וכו׳.

a person should associate himself with the congregation and should not pray for himself alone. How should he say it? May it be Your will, Lord our God, that You lead us to peace, etc., in the plural.

אימת מצלי? אמר רבי יעקב אמר רב חסדא: משעה שמהלך בדרך. עד כמה? אמר רבי יעקב אמר רב חסדא: עד פרסה. והיכי מצלי לה? רב חסדא אמר: מעומד. רב ששת אמר: אפילו מהלך.

The Talmud discusses specific details pertaining to this prayer. When does one pray? R' Ya’akov said that Rav Ḥisda said: From when one sets out on his journey, and not before. How long must one’s planned journey be in order to require him to recite this prayer (Ba’al Halakhot Gedolot)? R' Ya’akov said that Rav Ḥisda said: At least a parasang. How does he recite this prayer? Rav Ḥisda said: Only while standing in one place. Rav Sheshet said: Even walking or sitting.

רב חסדא ורב ששת הוו קאזלי באורחא, קם רב חסדא וקא מצלי. אמר ליה רב ששת לשמעיה: מאי קא עביד רב חסדא? אמר ליה קאי ומצלי. אמר ליה: אוקמן נמי לדידי ואצלי, ״מהיות טוב אל תקרא רע״.

The Talmud relates: Rav Ḥisda and Rav Sheshet were walking along the path, Rav Ḥisda stood and recited the traveler’s prayer. Since he was blind and did not see his colleague, Rav Sheshet asked his servant: What is Rav Ḥisda doing now? His servant said to him: He is standing and praying. Rav Sheshet said to his servant: Stand me up as well and I will pray. Even though Rav Sheshet held that there is no need to stand during this prayer, nevertheless: From being good, do not be called wicked. In other words, one should do better if he is able. Rav Sheshet said that one is not required to stop and stand. He did not say that it is preferable to walk or sit. Since standing in this case required no special effort on his part, as Rav Ḥisda had stopped to stand and pray anyway, why insist on sitting?