Messenger of Allah (S) said: "When one of you performs Wudu and does so well, then he leaves intending to go to the Masjid, then let him not intertwine his fingers, for indeed he is in Salat."  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ إِذَا تَوَضَّأَ أَحَدُكُمْ فَأَحْسَنَ وُضُوءَهُ ثُمَّ خَرَجَ عَامِدًا إِلَى الْمَسْجِدِ فَلاَ يُشَبِّكَنَّ بَيْنَ أَصَابِعِهِ فَإِنَّهُ فِي صَلاَةٍ