There is no loss in prayer nor in salutation. Ahmad(b. Hanbal) said: This means, I think, that you do not salute nor you are saluted by others. The loss of a man in his prayer is that a man remains doubtful about it when he finishes it.
عَنِ النَّبِيِّ ﷺ قَالَ لاَ غِرَارَ فِي صَلاَةٍ وَلاَ تَسْلِيمٍ قَالَ أَحْمَدُ يَعْنِي فِيمَا أُرَى أَنْ لاَ تُسَلِّمَ وَلاَ يُسَلَّمَ عَلَيْكَ وَيُغَرِّرُ الرَّجُلُ بِصَلاَتِهِ فَيَنْصَرِفُ وَهُوَ فِيهَا شَاكٌّ
[Machine] From the Prophet ﷺ , he said, "There is no deception in prayer or in the greetings." Ahmad ibn Hanbal said from what he saw that he wanted not to give the greeting and to give the greeting to you. The deception of a person in his prayer is to give the greeting while he is doubting in it.
عَنِ النَّبِيِّ ﷺ قَالَ «لَا غِرَارَ فِي صَلَاةٍ وَلَا تَسْلِيمٍ» قَالَ أَحْمَدُ بْنُ حَنْبَلٍ فِيمَا رَأَى أَنَّهُ أَرَادَ أَنْ لَا يُسَلِّمَ وَيُسَلَّمَ عَلَيْكَ وَتَغْرِيرُ الرَّجُلِ بِصَلَاتِهِ أَنْ يُسَلِّمَ وَهُوَ فِيهَا شَاكٌّ هَذَا