He may have in mind the Scriptural examples of accompanying an oath with a gesture. For a Christian, more important than making a certain gesture when taking an oath is that he remembers that he is swearing before God to tell the truth.
ऐसा वह बाइबल में दिए उन लोगों की मिसालों को ध्यान में रखकर कर सकता है जिन्होंने शपथ खाते वक्‍त कुछ हाव - भाव भी किए थे ।