Matthew 18:4

18:4 Whoever then humbles himself like this little child is the greatest in the kingdom of heaven.

Matthew 27:42

27:42 “He saved others, but he cannot save himself! He is the king of Israel! If he comes down ¹  now from the cross, we will believe in him!

[27:42]  ¹ tn Here the aorist imperative καταβάτω (katabatw) has been translated as a conditional imperative. This fits the pattern of other conditional imperatives (imperative + καί + future indicative) outlined by ExSyn 489.