It is narrated from the words of Anas ibn Malik that the Messenger of Allah (peace and blessings of Allaah be upon him) said:
“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 (along with the imam), and make up (on his own) for what he missed and preceded him (after the Imam is finished).”
This hadith was narrated by Ahmad 3/106, Abu Dawood 763, al-Bayhaqi 3/228 and ad-Diya al-Maqdisi.
Sheikh al-Albani called the hadith authentic. See Sahih al-jami ‘as-saghir 459.
459 ( صحيح )
إذا جاء أحدكم إلى الصلاة فليمش على هينة فليصل ما أدرك و ليقض ما سبقه
( حم د هق الضياء ) عن أنس .
Khadeeja