The following is from a work-in-progress called The Qur'an: a Book Report, in which I read each surah of the Qur'an and write about what I learn.
This is a Medinan surah which encourages believers to stick together in support of "God's cause". It states, "God truly loves those who fight in solid lines for His cause, like a well-compacted building." Like the previous surah, this one draws some "solid lines" of division between Muslims and non-Muslims.
And yet, ironically, the examples of faithfulness which the surah cites are Jewish and Christian! Moses is cited as one who eschewed idolatry and remained faithful to God. Jesus and his disciples are also cited as positive examples of faithfulness to God: "As Jesus, son of Mary, said to the disciples, 'Who will be my helpers in God's cause?' The disciples said, 'We shall be God's helpers.'"