Exchanging salam with every body

عَنْ عَبْدِ اللَّهِ بْنِ عَمْرٍو رَضِيَ اللَّهُ عَنْهُمَا: أَنَّ رَجُلًا سَأَلَ النَّبِيَّ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ: أَيُّ الإِسْلاَمِ خَيْرٌ؟ قَالَ: «تُطْعِمُ الطَّعَامَ، وَتَقْرَأُ السَّلاَمَ عَلَى مَنْ عَرَفْتَ وَمَنْ لَمْ تَعْرِفْ
[صحيح] - [متفق عليه] - [صحيح البخاري - 12]
Meaning:
On the authority of Abdullah Ibn Amr (may Allah be pleased with them both): A man asked the Prophet (peace and blessings be upon him): “Which Islam is the best?” He said: “To feed the people and say salam those you know and those you do not know.
[ Sahih ] - [ Muttafiqun alaihi ] - [ Sahih Al-Bukhari - 12

Salam is a name of Allahu tawala, spread it among yourselves

السلامُ اسمٌ من أسماءِ اللهِ وضَعَهُ اللهُ في الأرضِ ، فأفْشُوهُ بينَكمْ ، فإنَّ الرجلَ المسلمَ إذا مَرَّ بقومٍ فسلَّمَ عليهم ، فردُّوا عليه ؛ كان لهُ عليهم فضلُ درجةٍ بتذكيرِهِ إيَّاهُمُ السلامَ ، فإنْ لمْ يرُدُّوا عليه رَدَّ عليه مَنْ هوَ خيرٌ مِنهمْ وأطْيبُ لمصدر: صحيح الجامع
الراوي: عبدالله بن مسعود
المحدث: الألباني
خلاصة حكمه: صحيح


Meaning:
Salaam ( Peace ) is one of the names of Allah that He has placed on earth, so spread it among yourselves. If a Muslim man passes by a group of people and greets them, and they return his greeting, he will have a higher rank than them for reminding them of peace. If they do not reply to his greeting, someone better and more virtuous than them will reply to it to him.
Source:Sahih al-Jami'
Narrator:Abdullah bin Masoud
The narrator:Albanian
Summary of his ruling: correct