In India, as all across Asia, the left hand is for wiping your bottom, cleaning your feet .

It is clear from several biblical verses that "right hand" was often a symbol for strength. The "right hand of God" was that which overcame Israel's enemies (Ex. 15:6, 12; Isa. 62:8; Ps. 17:7; 44:4, etc.) and which was worthy of the Psalmists' praises (Ps. 98:1; 118:15, 16, etc.). The "right eye" was considered the more valuable (Zech. 11:17) and it was the putting out of "every right eye" which Nahash the Ammonite demanded in return for making a nonaggresion pact with the inhabitants of Jabesh-Gilead (I Sam. 11:2). Conversely, that left-handedness was conceived of as a weakness, even a malady, is seen from the description of Ehud (Judg. 3:15), where the latter is called ʾishʾiṭṭer yad yemino (אִישׁ אִטֵּר יַד יְמִינוֹ), "a man obstructed [in the use of] his right hand." The word used for "obstructed" is of the nominal construction that is usually utilized for physical defects–e.g., "blind" (עִוֵּר), "dumb" (אִלֵּם), and "deaf " (חֵרֵשׁ).