´It was narrated that Anas said:` "The Messenger of Allah (ﷺ) was leading us in prayer when a man came and entered the masjid, and he was out of breath. He said: 'Allahu Akbar, al-hamdulillahi hamdan kathiran tayiban mubarakan fih. (Allah is Most Great, praise be to Allah, much good and blessed praise.)' When the Messenger of Allah (ﷺ) had finished his prayer he said: 'Which of you is the one who spoke these words?' The people kept quiet. He said: 'He did not say anything bad.' The man said: 'I did, O Messenger of Allah. I came and I was out of breath, and I said it.' The Prophet (ﷺ) said: 'I saw twelve angels rushing to see which of them would take it up.'"
Hadith Referenceسنن نسائي / كتاب الافتتاح / 902
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:صحيح مسلم
➊ The fact that he was out of breath is evidence that the Companion (radi Allahu anhu) came to the prayer rather quickly. Thus, moving with a speed less than running is permissible, provided that seriousness and dignity are maintained.
➋ Because he was out of breath, he could not control his voice, so his voice became loud and was heard by others.
➌ The mutual relationship of the Prophet (sallallahu alayhi wa sallam) with the noble Companions (radi Allahu anhum) was extremely compassionate, and he would always console and encourage his Companions on every good occasion.
Source: Sunan Nasa'i: Translation and Benefits by Shaykh Hafiz Muhammad Amin Hafizullah, Page: 902
Anas bin Malik said: A man came panting to join the row of worshippers, and said: Allah is most great; praise be to Allah, much praise, good and blessed. When the Messenger of Allah ﷺ finished his prayer, he asked: Which of you is the one who spoke the words? He said nothing wrong. Then the man said: I (said), Messenger of Allah ﷺ; I came and had difficulty in breathing, so I said them. He said: I saw twelve angels racing against one another to be the one to take them to Allah. The narrator Humaid added: When any of you comes for praying, he should walk as usual (i. e. he should not hasten and run quickly); then he should pray as much as he finds it (along with the imam), and should offer the part of the prayer himself (when the prayer is finished) which the Imam had offered before him.
Shaykh Umar Farooq Saeedi
763. Commentary: ➊ These pure words are extremely blessed, and it is recommended (mustahabb) to recite them as praise (thana). ➋ It is apparent that this Companion (radi Allahu anhu) uttered these words in a loud voice, but for us, reciting them aloud will not be considered Sunnah, otherwise it would cause disturbance to other worshippers.
Source: Sunan Abu Dawood – Commentary by Shaykh Umar Farooq Saeedi, Page: 763