Look at those uses of double object pronouns in sentences in Mode impératif:
When you use Impératif with object pronouns, you have to consider three things:
- Object pronouns me/te become stress pronouns moi/toi
- The verb comes first, followed by the two object pronouns, each hyphenated (-) to the word before
- Direct object pronouns le/la/les are placed before indirect object pronouns moi/toi/lui/nous/vous/leur
BUTAdverbial pronouns en/y are placed after moi/toi/lui/nous/vous/leur
and moi/toi become m' and t'
You don't put an hyphen between the two pronouns, when using t' / m' before y or en.
See also En can replace de + phrase (adverbial pronoun)