أَخْبَرَنَا زَكَرِيَّا بْنُ يَحْيَى السِّجْزِيُّ، - يُعْرَفُ بِخَيَّاطِ السُّنَّةِ نَزَلَ بِدِمَشْقَ أَحَدُ الثِّقَاتِ - قَالَ حَدَّثَنَا الْحَسَنُ بْنُ عِيسَى قَالَ أَنْبَأَنَا ابْنُ الْمُبَارَكِ قَالَ حَدَّثَنَا مَخْرَمَةُ بْنُ بُكَيْرٍ قَالَ أَنْبَأَنَا عَامِرُ بْنُ عَبْدِ اللَّهِ بْنِ الزُّبَيْرِ عَنْ أَبِيهِ قَالَ كَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم إِذَا جَلَسَ فِي الثِّنْتَيْنِ أَوْ فِي الأَرْبَعِ يَضَعُ يَدَيْهِ عَلَى رُكْبَتَيْهِ ثُمَّ أَشَارَ بِأُصْبُعِهِ ‏.‏
Translation
'Amr bin 'Abdullah bin Az-Zubair narrated that

His father said: "When the Messenger of Allah (ﷺ) sat in the second or fourth rak'ah, he would place his hands on his knees and point with his finger."

Comment

The Book of The At-Tatbiq (Clasping One's Hands Together)

Sunan an-Nasa'i - Hadith Reference: Sunan an-Nasa'i 1161

Hadith Text

"His father said: 'When the Messenger of Allah (ﷺ) sat in the second or fourth rak'ah, he would place his hands on his knees and point with his finger.'"

Commentary on the Posture

This narration establishes the sunnah of placing both hands upon the knees during the sitting position (tashahhud) in the second and fourth rak'ahs of prayer. The hands should be spread out with fingers extended toward the qiblah, demonstrating calmness and reverence in prayer.

Significance of Finger Pointing

The act of pointing with the index finger signifies tawhid (divine unity) and serves as a reminder of Allah's oneness throughout the recitation of tashahhud. The finger should be raised during the declaration "Ashhadu an la ilaha illa Allah" and may be gently moved up and down as a form of devotion, though excessive movement is discouraged.

Distinction Between Rakahs

The specification of second and fourth rak'ahs indicates that this posture differs from the final sitting where the full tashahhud is recited with additional blessings upon the Prophet. This demonstrates the precision of the Prophet's prayer and the importance of observing distinctions between various positions within salah.

Legal Ruling

This practice is considered sunnah mu'akkadah (emphasized tradition) according to the majority of scholars. While omitting it doesn't invalidate prayer, consistently following this prophetic example earns greater reward and completes the perfection of one's prayer.