AbuThumamah al-Hannat said that Ka'b ibn Ujrah met him while he was going to the mosque; one of the two (companions) met his companion (on his way to the mosque) And he met crossing the fingers of my both hands. He prohibited me to do so, and said: The Messenger of Allah ﷺ has said: If any of you performs ablution, and performs his ablution perfectly, and then goes out intending for the mosque, he should not cross the fingers of his hand because he is already in prayer.  

وَقَالَ إِنَّ رَسُولَ اللَّهِ ﷺ قَالَ إِذَا تَوَضَّأَ أَحَدُكُمْ فَأَحْسَنَ وُضُوءَهُ ثُمَّ خَرَجَ عَامِدًا إِلَى الْمَسْجِدِ فَلاَ يُشَبِّكَنَّ يَدَيْهِ فَإِنَّهُ فِي صَلاَةٍ  

Sa'id ibn al-Musayyab said: An Ansari was breathing his last. He said: I narrate to you a tradition, and I narrate it with the intention of getting a reward from Allah. I heard the Messenger of Allah ﷺ say: If any one of you performs ablution and performs it very well, and goes out for prayer, he does not take his right step but Allah records a good work (or blessing) for him, and he does not take his left step but Allah remits one sin from him. Any one of you may reside near the mosque or far from it; if he comes to the mosque and prays in congregation, he will be forgiven (by Allah). If he comes to the mosque while the people had prayed in part, and the prayer remained in part, and he prays in congregation the part he joined, and completed the part he had missed, he will enjoy similarly (i.e. he will be forgiven). If he comes to the mosque when the people had finished prayer, he will enjoy the same.  

إِنِّي مُحَدِّثُكُمْ حَدِيثًا مَا أُحَدِّثُكُمُوهُ إِلاَّ احْتِسَابًا سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ إِذَا تَوَضَّأَ أَحَدُكُمْ فَأَحْسَنَ الْوُضُوءَ ثُمَّ خَرَجَ إِلَى الصَّلاَةِ لَمْ يَرْفَعْ قَدَمَهُ الْيُمْنَى إِلاَّ كَتَبَ اللَّهُ ﷻ لَهُ حَسَنَةً وَلَمْ يَضَعْ قَدَمَهُ الْيُسْرَى إِلاَّ حَطَّ اللَّهُ ﷻ عَنْهُ سَيِّئَةً فَلْيُقَرِّبْ أَحَدُكُمْ أَوْ لِيُبَعِّدْ فَإِنْ أَتَى الْمَسْجِدَ فَصَلَّى فِي جَمَاعَةٍ غُفِرَ لَهُ فَإِنْ أَتَى الْمَسْجِدَ وَقَدْ صَلَّوْا بَعْضًا وَبَقِيَ بَعْضٌ صَلَّى مَا أَدْرَكَ وَأَتَمَّ مَا بَقِيَ كَانَ كَذَلِكَ فَإِنْ أَتَى الْمَسْجِدَ وَقَدْ صَلَّوْا فَأَتَمَّ الصَّلاَةَ كَانَ كَذَلِكَ