TB Khullin 106 How much of your hands do you have to wash before eating bread?

Before eating bread we wash our hands ritually and recite the blessing 

"בָרוּךְ אַתָה ה', אֱ-לֹהֵינוּ מֶלֶךְ הָעוֹלָם, אֲשֶר קִדְשָנוּ בְמִצְוֹתָיו וְצִוָנוּ עַל נְטִילַת יָדַיִם. -Praise are You, LORD our God, King of the Universe, who has sanctified us through His commandments, and has commanded us about washing hands.” If you look at your hand, you’ll see three joints. The first joint is nearest to the tip of your finger. The second joint is at your knuckles. The third joint is closest to your wrist. Today’s daf TB Khullin 106 discusses how much of your hands to have to wash before eating bread.

“The Sages taught in a baraita: In washing of the hands for consumption of non-sacred food, one must pour the water on the area that extends until the joint of the fingers. In washing hands for consumption of teruma, he must pour on the area extending until the joint. In sanctifying the hands and feet in the Temple before the service, he must pour the water until another joint, where the palm meets the wrist…

“Rav said this halakha to his students while indicating with his hand the joints to which the baraita is referring: One washes until here, the second joint of the fingers, for non-sacred food, and until there, the third joint, where the fingers join the palm, for teruma. And Shmuel disagreed and said: One washes until here both for eating non-sacred food and for teruma, indicating the more stringent location, the third joint where the fingers join the palm. And Rav Sheshet said: Until here both for the consumption of non-sacred food and for teruma, indicating the more lenient location, the second joint.

“Bar Hedya said: I was standing before Rabbi Ami, and he said: One washes until here both for non-sacred food and for teruma, indicating the more stringent location, the third joint. And do not say that Rabbi Ami acted this way only because he is a priest and acted stringently to avoid confusing teruma and non-sacred food. This cannot be, as Rabbi Meyasha, son of the son of Rabbi Yehoshua ben Levi, is a Levite, and yet he too said: Until here both for non-sacred food and for teruma, indicating the more stringent location.” (Sefaria.org translation)

Our tradition is to be stringent as Shmuel teaches and wash our hands up to the point where our palms meet our arms. (Rambam, Mishneh Torah, Sefer Ahavah, Chapter 6, Halakha 4)