Tafseer Ibn Khatheer - Sorah As-Saaffat ( Those Ranges in Ranks )

إِذْ قَالَ لِقَوْمِهِ أَلَا تَتَّقُونَ (124) (As-Saaffat ( Those Ranges in Ranks ))

أَيْ أَلَا تَخَافُونَ اللَّه عَزَّ وَجَلَّ فِي عِبَادَتكُمْ غَيْره .

Source : http://www.quraninformation.com/t-37-1-124.html