It is narrated from Hazrat Anas (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: When any one of you comes for prayer, he should walk calmly. Whatever part of the prayer he catches, he should perform, and whatever he misses, he should complete it later.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 13397
Hadith Gradingحکم دارالسلام:حديث صحيح، وهذا إسناد قوي.