Nafi‘ said that when ‘Abdallah b. ‘Umar sat during the prayer he placed his hands on his knees, pointed with his finger and gave his whole attention to it. He then said that God’s Messenger had said, “It has a more severe effect on the devil than iron,” meaning the forefinger.
God’s Messenger used to teach us the tashahhud just as he would teach us a sura of the Qur’an, saying, “In the name of God and with His grace. The adorations of the tongue, acts of worship and all good things are due to God. Peace be upon you, O Prophet, and God’s mercy and blessings. Peace be upon us and upon God’s upright servants. I testify that there is no god but God, and I testify that Muhammad is His servant and Messenger. I ask God for paradise, and I seek refuge in God from hell.”